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 a1c7eb260ef4d7da1b9c9185834b41edde9277f6..4eab34b29dca830cbb9debd49617e1b9e0131b5e 100644
--- a/ui/gl/async_pixel_transfer_delegate_android.cc
+++ b/ui/gl/async_pixel_transfer_delegate_android.cc
@@ -372,6 +372,8 @@ class AsyncPixelTransferDelegateAndroid
       AsyncPixelTransferState* state) OVERRIDE;
   virtual uint32 GetTextureUploadCount() OVERRIDE;
   virtual base::TimeDelta GetTotalTextureUploadTime() OVERRIDE;
+  virtual void ProcessPendingTransfers() OVERRIDE;
+  virtual bool HasPendingTransfers() OVERRIDE;
 
  private:
   // implement AsyncPixelTransferDelegate:
@@ -609,6 +611,13 @@ base::TimeDelta AsyncPixelTransferDelegateAndroid::GetTotalTextureUploadTime() {
   return total_texture_upload_time;
 }
 
+void AsyncPixelTransferDelegateAndroid::ProcessPendingTransfers() {}
+
+bool AsyncPixelTransferDelegateAndroid::HasPendingTransfers() {
+  return false;
+}
+
+
 namespace {
 void SetGlParametersForEglImageTexture() {
   // These params are needed for EGLImage creation to succeed on several