Avoid generating an ap_ file for android_library

Saves roughly 200ms per aapt invocation, when aapt is only used
for validation of resources.

--
MOS_MIGRATED_REVID=121863470

src/main/java/com/google/devtools/build/lib/rules/android/AndroidLibrary.java

@@ -81,7 +81,7 @@ public ConfiguredTarget create(RuleContext ruleContext) throws InterruptedExcept
         return null;
       }
       resourceApk = applicationManifest.packWithDataAndResources(
-          ruleContext.getImplicitOutputArtifact(AndroidRuleClasses.ANDROID_RESOURCES_APK),
+          null, /* resourceApk -- not needed for library */
           ruleContext,
           true, /* isLibrary */
           ResourceDependencies.fromRuleDeps(ruleContext, JavaCommon.isNeverLink(ruleContext)),
@@ -148,14 +148,12 @@ public ConfiguredTarget create(RuleContext ruleContext) throws InterruptedExcept
       aar = null;
       ApplicationManifest applicationManifest = ApplicationManifest.generatedManifest(ruleContext);
 
-      Artifact apk = ruleContext.getImplicitOutputArtifact(
-          AndroidRuleClasses.ANDROID_RESOURCES_APK);
-
       String javaPackage = AndroidCommon.getJavaPackage(ruleContext);
 
       ResourceContainer resourceContainer = new ResourceContainer(ruleContext.getLabel(),
           javaPackage, null /* renameManifestPackage */, false /* inlinedConstants */,
-          apk, applicationManifest.getManifest(),
+          null /* resourceApk -- not needed for library */,
+          applicationManifest.getManifest(),
           ruleContext.getImplicitOutputArtifact(AndroidRuleClasses.ANDROID_JAVA_SOURCE_JAR),
           ImmutableList.<Artifact>of(), ImmutableList.<Artifact>of(),
           ImmutableList.<PathFragment>of(), ImmutableList.<PathFragment>of(),
@@ -164,7 +162,6 @@ public ConfiguredTarget create(RuleContext ruleContext) throws InterruptedExcept
 
       primaryResources = new AndroidResourcesProcessorBuilder(ruleContext)
           .setLibrary(true)
-          .setApkOut(apk)
           .setRTxtOut(resourceContainer.getRTxt())
           .setManifestOut(ruleContext.getImplicitOutputArtifact(
               AndroidRuleClasses.ANDROID_PROCESSED_MANIFEST))

src/main/java/com/google/devtools/build/lib/rules/android/AndroidResourceContainerBuilder.java

@@ -55,19 +55,20 @@ public AndroidResourceContainerBuilder withInlinedConstants(boolean inlineContan
 
   /** Creates a {@link ResourceContainer} from a {@link RuleContext}. 
    * @throws InterruptedException */
-  public ResourceContainer buildFromRule(RuleContext ruleContext, Artifact apk)
+  public ResourceContainer buildFromRule(RuleContext ruleContext, @Nullable Artifact apk)
       throws InterruptedException {
     Preconditions.checkNotNull(this.manifest);
     Preconditions.checkNotNull(this.data);
+    Artifact rJavaSrcJar = ruleContext.getImplicitOutputArtifact(
+        AndroidRuleClasses.ANDROID_JAVA_SOURCE_JAR);
     return new AndroidResourcesProvider.ResourceContainer(
             ruleContext.getLabel(),
-            getJavaPackage(ruleContext, apk),
+            getJavaPackage(ruleContext, rJavaSrcJar),
             getRenameManifestPackage(ruleContext),
             inlineConstants,
             apk,
             manifest,
-            ruleContext.getImplicitOutputArtifact(
-                AndroidRuleClasses.ANDROID_JAVA_SOURCE_JAR),
+            rJavaSrcJar,
             data.getAssets(),
             data.getResources(),
             data.getAssetRoots(),
@@ -77,18 +78,18 @@ public ResourceContainer buildFromRule(RuleContext ruleContext, Artifact apk)
             symbolsFile);
   }
 
-  private String getJavaPackage(RuleContext ruleContext, Artifact apk) {
+  private String getJavaPackage(RuleContext ruleContext, Artifact rJavaSrcJar) {
     if (hasCustomPackage(ruleContext)) {
       return ruleContext.attributes().get("custom_package", Type.STRING);
     }
     // TODO(bazel-team): JavaUtil.getJavaPackageName does not check to see if the path is valid.
     // So we need to check for the JavaRoot.
-    if (JavaUtil.getJavaRoot(apk.getExecPath()) == null) {
+    if (JavaUtil.getJavaRoot(rJavaSrcJar.getExecPath()) == null) {
       ruleContext.ruleError("You must place your code under a directory named 'java' or "
           + "'javatests' for blaze to work. That directory (java,javatests) will be treated as "
           + "your java source root. Alternatively, you can set the 'custom_package' attribute.");
     }
-    return JavaUtil.getJavaPackageName(apk.getExecPath());
+    return JavaUtil.getJavaPackageName(rJavaSrcJar.getExecPath());
   }
 
   private boolean hasCustomPackage(RuleContext ruleContext) {

src/main/java/com/google/devtools/build/lib/rules/android/AndroidResourcesProcessorBuilder.java

@@ -389,9 +389,9 @@ public ResourceContainer build(ActionConstructionContext context) {
         primary.getRenameManifestPackage(),
         primary.getConstantsInlined(),
         // If there is no apk to be generated, use the apk from the primary resources.
-        // All ResourceContainers have to have an apk, but if a new one is not requested to be built
-        // for this resource processing action (in case of just creating an R.txt or
-        // proguard merging), reuse the primary resource from the dependencies.
+        // All android_binary ResourceContainers have to have an apk, but if a new one is not
+        // requested to be built for this resource processing action (in case of just creating an
+        // R.txt or proguard merging), reuse the primary resource from the dependencies.
         apkOut != null ? apkOut : primary.getApk(),
         manifestOut != null ? manifestOut : primary.getManifest(),
         sourceJarOut,

src/main/java/com/google/devtools/build/lib/rules/android/AndroidResourcesProvider.java

@@ -108,8 +108,10 @@ public static final class ResourceContainer {
     public ResourceContainer(Label label,
         String javaPackage,
         @Nullable String renameManifestPackage,
-        boolean constantsInlined, Artifact apk,
-        Artifact manifest, Artifact javaSourceJar,
+        boolean constantsInlined,
+        @Nullable Artifact apk,
+        Artifact manifest,
+        Artifact javaSourceJar,
         ImmutableList<Artifact> assets,
         ImmutableList<Artifact> resources,
         ImmutableList<PathFragment> assetsRoots,
@@ -123,7 +125,7 @@ public ResourceContainer(Label label,
       this.javaPackage = Preconditions.checkNotNull(javaPackage);
       this.renameManifestPackage = renameManifestPackage;
       this.constantsInlined = constantsInlined;
-      this.apk = Preconditions.checkNotNull(apk);
+      this.apk = apk;
       this.manifest = Preconditions.checkNotNull(manifest);
       this.assets = Preconditions.checkNotNull(assets);
       this.resources = Preconditions.checkNotNull(resources);

src/main/java/com/google/devtools/build/lib/rules/android/AndroidRuleClasses.java

@@ -314,7 +314,6 @@ public Iterable<String> getImplicitOutputs(AttributeMap attributes) {
           if (LocalResourceContainer.definesAndroidResources(attributes)) {
             implicitOutputs.add(
                 AndroidRuleClasses.ANDROID_JAVA_SOURCE_JAR,
-                AndroidRuleClasses.ANDROID_RESOURCES_APK,
                 AndroidRuleClasses.ANDROID_R_TXT);
           }
 

src/main/java/com/google/devtools/build/lib/rules/android/ApplicationManifest.java

@@ -237,11 +237,9 @@ public ResourceApk packWithAssets(
         null /* Artifact mergedResources */);
   }
 
-  /** Packages up the manifest with resource and assets from the rule and dependent resources.
-   * @param manifestOut TODO(corysmith):
-   * @throws InterruptedException */
+  /** Packages up the manifest with resource and assets from the rule and dependent resources. */
   public ResourceApk packWithDataAndResources(
-      Artifact resourceApk,
+      @Nullable Artifact resourceApk,
       RuleContext ruleContext,
       boolean isLibrary,
       ResourceDependencies resourceDeps,
@@ -296,7 +294,8 @@ public ResourceApk packWithDataAndResources(
         mergedResources);
   }
 
-  private ResourceApk createApk(Artifact resourceApk,
+  private ResourceApk createApk(
+      @Nullable Artifact resourceApk,
       RuleContext ruleContext,
       boolean isLibrary,
       ResourceDependencies resourceDeps,

src/tools/android/java/com/google/devtools/build/android/AndroidResourceProcessor.java

@@ -369,7 +369,7 @@ public void processResources(
         .maybeAdd("-m", sourceOut != null)
         .maybeAdd("-J", prepareOutputPath(sourceOut), sourceOut != null)
         .maybeAdd("--output-text-symbols", prepareOutputPath(sourceOut), sourceOut != null)
-        .add("-F", packageOut)
+        .maybeAdd("-F", packageOut, packageOut != null)
         .add("-G", proguardOut)
         .maybeAdd("-D", mainDexProguardOut, new FullRevision(24))
         .add("-P", publicResourcesOut)