gpu: Implement idle async pixel transfers.

ui/gl/async_pixel_transfer_delegate_android.cc

Index: ui/gl/async_pixel_transfer_delegate_android.cc
diff --git a/ui/gl/async_pixel_transfer_delegate_android.cc b/ui/gl/async_pixel_transfer_delegate_android.cc
index 6a3463950adc74b66cc79ff6769a273be22c48f8..9d741c1bf27b029eadedae9f5aff14f80f87e48f 100644
--- a/ui/gl/async_pixel_transfer_delegate_android.cc
+++ b/ui/gl/async_pixel_transfer_delegate_android.cc
@@ -384,6 +384,8 @@ class AsyncPixelTransferDelegateAndroid
       AsyncPixelTransferState* state) OVERRIDE;
   virtual uint32 GetTextureUploadCount() OVERRIDE;
   virtual base::TimeDelta GetTotalTextureUploadTime() OVERRIDE;
+  virtual bool ProcessMorePendingTransfers() OVERRIDE;
+  virtual bool NeedsProcessMorePendingTransfers() OVERRIDE;
 
  private:
   // implement AsyncPixelTransferDelegate:
@@ -658,6 +660,15 @@ base::TimeDelta AsyncPixelTransferDelegateAndroid::GetTotalTextureUploadTime() {
   return total_texture_upload_time;
 }
 
+bool AsyncPixelTransferDelegateAndroid::ProcessMorePendingTransfers() {
+  return false;
+}
+
+bool AsyncPixelTransferDelegateAndroid::NeedsProcessMorePendingTransfers() {
+  return false;
+}
+
+
 namespace {
 void SetGlParametersForEglImageTexture() {
   // These params are needed for EGLImage creation to succeed on several