Make ui::Snapshot asynchronous on Android, remove CompositeAndReadback.

content/browser/android/content_view_render_view.cc

Index: content/browser/android/content_view_render_view.cc
diff --git a/content/browser/android/content_view_render_view.cc b/content/browser/android/content_view_render_view.cc
index 4a398859b1e66ae16a7b7a3affae264af53f3e25..3199be363b26c42adc16166faffb95a22b0ecd0c 100644
--- a/content/browser/android/content_view_render_view.cc
+++ b/content/browser/android/content_view_render_view.cc
@@ -55,7 +55,8 @@ ContentViewRenderView::ContentViewRenderView(JNIEnv* env,
                                              gfx::NativeWindow root_window)
     : layer_tree_build_helper_(new LayerTreeBuildHelperImpl()),
       root_window_(root_window),
-      current_surface_format_(0) {
+      current_surface_format_(0),
+      weak_ptr_factory_(this) {
   java_obj_.Reset(env, obj);
 }
 
@@ -117,15 +118,6 @@ void ContentViewRenderView::SurfaceChanged(JNIEnv* env, jobject obj,
   compositor_->SetWindowBounds(gfx::Size(width, height));
 }
 
-jboolean ContentViewRenderView::CompositeToBitmap(JNIEnv* env, jobject obj,
-                                                  jobject java_bitmap) {
-  gfx::JavaBitmap bitmap(java_bitmap);
-  if (!compositor_ || bitmap.format() != ANDROID_BITMAP_FORMAT_RGBA_8888)
-    return false;
-  return compositor_->CompositeAndReadback(bitmap.pixels(),
-                                           gfx::Rect(bitmap.size()));
-}
-
 void ContentViewRenderView::SetOverlayVideoMode(
     JNIEnv* env, jobject obj, bool enabled) {
   compositor_->SetHasTransparentBackground(enabled);