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

content/browser/android/content_view_core_impl.cc

Index: content/browser/android/content_view_core_impl.cc
diff --git a/content/browser/android/content_view_core_impl.cc b/content/browser/android/content_view_core_impl.cc
index 182c0a6f336ca2071a3303065f41072bb9fa2e4b..5de8890859b969e53fb1638ba2a092ce4737ca41 100644
--- a/content/browser/android/content_view_core_impl.cc
+++ b/content/browser/android/content_view_core_impl.cc
@@ -8,6 +8,7 @@
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "base/android/scoped_java_ref.h"
+#include "base/callback_helpers.h"
 #include "base/command_line.h"
 #include "base/json/json_writer.h"
 #include "base/logging.h"
@@ -591,14 +592,27 @@ void ContentViewCoreImpl::ShowPastePopup(int x_dip, int y_dip) {
                                       static_cast<jint>(y_dip));
 }
 
-unsigned int ContentViewCoreImpl::GetScaledContentTexture(
+void ContentViewCoreImpl::OnFinishGetScaledContentBitmap(
+    const base::Callback<void(bool, const SkBitmap&)>& compositor_callback,
+    bool success,

[no sievers, 2014/01/29 21:13:48]

Looks like you don't need this method anymore but can use the original callback
below.

[powei, 2014/01/30 00:54:12]

Done.

+    const SkBitmap& bitmap) {
+  compositor_callback.Run(success, bitmap);
+}
+
+void ContentViewCoreImpl::GetScaledContentBitmap(
     float scale,
-    gfx::Size* out_size) {
+    gfx::Size* out_size,
+    const base::Callback<void(bool, const SkBitmap&)>& compositor_callback) {
   RenderWidgetHostViewAndroid* view = GetRenderWidgetHostViewAndroid();
-  if (!view)
-    return 0;
+  if (!view || !view->IsSurfaceAvailableForCopy()) {
+    compositor_callback.Run(false, SkBitmap());
+    return;
+  }
 
-  return view->GetScaledContentTexture(scale, out_size);
+  base::Callback<void(bool, const SkBitmap&)> callback =
+      base::Bind(&ContentViewCoreImpl::OnFinishGetScaledContentBitmap,
+                 compositor_callback);
+  view->GetScaledContentBitmap(scale, out_size, callback);
 }
 
 void ContentViewCoreImpl::StartContentIntent(const GURL& content_url) {