Always report SkImage_Gpu subclasses as being texture backed.

Change-Id: I1af002df1b07f04543b32add94bfdc0a016a338b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/259284
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>

Author: egdaniel

src/image/SkImage_Gpu.h

@@ -35,7 +35,10 @@ class SkImage_Gpu : public SkImage_GpuBase {
         return fProxy;
     }
 
-    bool onIsTextureBacked() const override { return SkToBool(fProxy.get()); }
+    bool onIsTextureBacked() const override {
+        SkASSERT(fProxy);
+        return true;
+    }
 
     sk_sp<SkImage> onMakeColorTypeAndColorSpace(GrRecordingContext*,
                                                 SkColorType, sk_sp<SkColorSpace>) const final;

src/image/SkImage_GpuYUVA.h

@@ -35,7 +35,10 @@ class SkImage_GpuYUVA : public SkImage_GpuBase {
     GrTextureProxy* peekProxy() const override;
     sk_sp<GrTextureProxy> asTextureProxyRef(GrRecordingContext*) const override;
 
-    virtual bool onIsTextureBacked() const override { return fProxies[0] || fRGBProxy; }
+    bool onIsTextureBacked() const override {
+        SkASSERT(fProxies[0] || fRGBProxy);
+        return true;
+    }
 
     sk_sp<SkImage> onMakeColorTypeAndColorSpace(GrRecordingContext*,
                                                 SkColorType, sk_sp<SkColorSpace>) const final;