Roll ICU to c2a4cae

Changes to make this work:

- Had to change the use of an UBool constant `FALSE` to 0 because
  the file referring to it does not include the respective header.

- Had to change the license checker to ignore files in the directory
  icu/source/samples.  There were random changes to the licensing
  headers which tripped up license checks.  And since we don't include
  samples in the binaries we build, the most efficient way to fix it is
  to exclude sample code from license checks.

Issue: flutter/flutter#70370

Author: filmil

DEPS

@@ -143,7 +143,7 @@ deps = {
    Var('chromium_git') + '/chromium/src/ios.git' + '@' + Var('ios_tools_revision'),
 
   'src/third_party/icu':
-   Var('chromium_git') + '/chromium/deps/icu.git' + '@' + '715ec351c0bcdd6b2d22f36e7d33b8e2ec519846',
+   Var('chromium_git') + '/chromium/deps/icu.git' + '@' + 'c2a4cae149aae7fd30c4cbe3cf1b30df03b386f1',
 
   'src/third_party/khronos':
    Var('chromium_git') + '/chromium/src/third_party/khronos.git' + '@' + '7122230e90547962e0f0c627f62eeed3c701f275',

ci/licenses_golden/licenses_third_party

@@ -1,2 +1,2 @@
-Signature: cb6e21d8ae26cdf8275f83c4efaa3fcc
+Signature: 1f9d73861a9bb353a12cfa2ba38f6a12
 

ci/licenses_golden/licenses_third_party.orig

@@ -70,7 +70,8 @@ static size_t toLanguageTag(char* output,
   }
 
   uErr = U_ZERO_ERROR;
-  outLength = uloc_toLanguageTag(likelyChars, output, outSize, FALSE, &uErr);
+  outLength =
+      uloc_toLanguageTag(likelyChars, output, outSize, /*false*/ 0, &uErr);
   if (U_FAILURE(uErr)) {
     // unable to build a proper language identifier
     ALOGD("uloc_toLanguageTag(\"%s\") failed: %s", likelyChars,

ci/licenses_golden/tool_signature

@@ -55,15 +55,18 @@ abstract class _RepositoryLicensedFile extends _RepositoryFile {
   static final RegExp _readmeNamePattern = RegExp(r'\b_*(?:readme|contributing|patents)_*\b', caseSensitive: false);
   static final RegExp _buildTimePattern = RegExp(r'^(?!.*gen$)(?:CMakeLists\.txt|(?:pkgdata)?Makefile(?:\.inc)?(?:\.am|\.in|)|configure(?:\.ac|\.in)?|config\.(?:sub|guess)|.+\.m4|install-sh|.+\.sh|.+\.bat|.+\.pyc?|.+\.pl|icu-configure|.+\.gypi?|.*\.gni?|.+\.mk|.+\.cmake|.+\.gradle|.+\.yaml|pubspec\.lock|\.packages|vms_make\.com|pom\.xml|\.project|source\.properties|.+\.obj|.+\.autopkg)$', caseSensitive: false);
   static final RegExp _docsPattern = RegExp(r'^(?:INSTALL|NEWS|OWNERS|AUTHORS|ChangeLog(?:\.rst|\.[0-9]+)?|.+\.txt|.+\.md|.+\.log|.+\.css|.+\.1|doxygen\.config|Doxyfile|.+\.spec(?:\.in)?)$', caseSensitive: false);
-  static final RegExp _devPattern = RegExp(r'^(?:codereview\.settings|.+\.~|.+\.~[0-9]+~|\.clang-format|\.gitattributes|\.landmines|\.DS_Store|\.travis\.yml|\.cirrus\.yml)$', caseSensitive: false);
+  static final RegExp _devPattern = RegExp(r'^(?:codereview\.settings|.+\.~|.+\.~[0-9]+~|\.clang-format|\.gitattributes|\.landmines|\.DS_Store|\.travis\.yml|\.cirrus\.yml|\.cache)$', caseSensitive: false);
   static final RegExp _testsPattern = RegExp(r'^(?:tj(?:bench|example)test\.(?:java\.)?in|example\.c)$', caseSensitive: false);
+  // The ICU library has sample code that will never get linked.
+  static final RegExp _icuSamplesPattern = RegExp(r'.*(?:icu\/source\/samples).*$', caseSensitive: false);
 
   bool get isIncludedInBuildProducts {
     return !io.name.contains(_readmeNamePattern)
         && !io.name.contains(_buildTimePattern)
         && !io.name.contains(_docsPattern)
         && !io.name.contains(_devPattern)
         && !io.name.contains(_testsPattern)
+        && !io.toString().contains(_icuSamplesPattern)
         && !isShellScript;
   }