Implement DelegatedFrameResourceCollectionClient::UnusedResourcesAreAvailable for Android.

content/browser/renderer_host/render_widget_host_view_android.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_widget_host_view_android.h"
 
 #include <android/bitmap.h>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
@@ skipping 716 matching lines @@
     uint32 output_surface_id) {
   cc::CompositorFrameAck ack;
   if (resource_collection_.get())
     resource_collection_->TakeUnusedResourcesForChildCompositor(&ack.resources);
   RenderWidgetHostImpl::SendSwapCompositorFrameAck(host_->GetRoutingID(),
                                                    output_surface_id,
                                                    host_->GetProcess()->GetID(),
                                                    ack);
 }
 
+void RenderWidgetHostViewAndroid::SendReturnedDelegatedResources(
+    uint32 output_surface_id) {
+  DCHECK(resource_collection_);
+
+  cc::CompositorFrameAck ack;
+  resource_collection_->TakeUnusedResourcesForChildCompositor(&ack.resources);
+  DCHECK(!ack.resources.empty());
+
+  RenderWidgetHostImpl::SendReclaimCompositorResources(
+      host_->GetRoutingID(),
+      output_surface_id,
+      host_->GetProcess()->GetID(),
+      ack);
+}
+
 void RenderWidgetHostViewAndroid::UnusedResourcesAreAvailable() {
-  // TODO(danakj): If no ack is pending, collect and send resources now.
+  if (ack_callbacks_.size())
+    return;
+  SendReturnedDelegatedResources(last_output_surface_id_);
 }
 
 void RenderWidgetHostViewAndroid::DestroyDelegatedContent() {
   if (are_layers_attached_)
     RemoveLayers();
   frame_provider_ = NULL;
   delegated_renderer_layer_ = NULL;
   layer_ = NULL;
 }
 
 void RenderWidgetHostViewAndroid::SwapDelegatedFrame(
     uint32 output_surface_id,
     scoped_ptr<cc::DelegatedFrameData> frame_data) {
   bool has_content = !texture_size_in_layer_.IsEmpty();
 
   if (output_surface_id != last_output_surface_id_) {
-    // TODO(danakj): Lose all resources and send them back here, such as:
-    // resource_collection_->LoseAllResources();
-    // SendReturnedDelegatedResources(last_output_surface_id_);
-
     // Drop the cc::DelegatedFrameResourceCollection so that we will not return
     // any resources from the old output surface with the new output surface id.
     if (resource_collection_.get()) {
+      if (resource_collection_->LoseAllResources())
+        SendReturnedDelegatedResources(last_output_surface_id_);
+
       resource_collection_->SetClient(NULL);
       resource_collection_ = NULL;
     }
     DestroyDelegatedContent();
 
     last_output_surface_id_ = output_surface_id;
   }
 
   if (!has_content) {
     DestroyDelegatedContent();
@@ skipping 720 matching lines @@
 // RenderWidgetHostView, public:
 
 // static
 RenderWidgetHostView*
 RenderWidgetHostView::CreateViewForWidget(RenderWidgetHost* widget) {
   RenderWidgetHostImpl* rwhi = RenderWidgetHostImpl::From(widget);
   return new RenderWidgetHostViewAndroid(rwhi, NULL);
 }
 
 } // namespace content