android: Migrate old content readback to use async readback (and delegated renderer)

content/browser/android/content_view_core_impl.h

Index: content/browser/android/content_view_core_impl.h
diff --git a/content/browser/android/content_view_core_impl.h b/content/browser/android/content_view_core_impl.h
index 93e1445a400a70ed767fc7b122e84af4d4bf74a9..0d5ba49ef5474d58c3c9f5f6ddd907a15f9aed7a 100644
--- a/content/browser/android/content_view_core_impl.h
+++ b/content/browser/android/content_view_core_impl.h
@@ -57,9 +57,10 @@ class ContentViewCoreImpl : public ContentViewCore,
   virtual void LoadUrl(NavigationController::LoadURLParams& params) OVERRIDE;
   virtual jint GetCurrentRenderProcessId(JNIEnv* env, jobject obj) OVERRIDE;
   virtual void ShowPastePopup(int x, int y) OVERRIDE;
-  virtual unsigned int GetScaledContentTexture(
+  virtual void GetScaledContentBitmap(
       float scale,
-      gfx::Size* out_size) OVERRIDE;
+      gfx::Size* out_size,
+      const ContentBitmapCallback& result_callback) OVERRIDE;
   virtual float GetDpiScale() const OVERRIDE;
   virtual void RequestContentClipping(const gfx::Rect& clipping,
                                       const gfx::Size& content_size) OVERRIDE;