[PPAPI] Add browser tests for compositor API

content/renderer/pepper/pepper_compositor_host.cc

Index: content/renderer/pepper/pepper_compositor_host.cc
diff --git a/content/renderer/pepper/pepper_compositor_host.cc b/content/renderer/pepper/pepper_compositor_host.cc
index 47c0fccfe6cb06198183de4377c305c91e2c0e9c..ce9e7a92bf075cafd12eae6b4c244948b7cc2c86 100644
--- a/content/renderer/pepper/pepper_compositor_host.cc
+++ b/content/renderer/pepper/pepper_compositor_host.cc
@@ -119,6 +119,28 @@ int32_t VerifyCommittedLayer(
   return PP_ERROR_BADARGUMENT;
 }
 
+// cc::Layer::SetNeedsCommit() is a protected method, we have to use a subclass
+// to make it assessable.
+class ContainerLayer : public cc::Layer {
+ public:
+  static scoped_refptr<cc::Layer> Create();
+  void ForceToCommit();
+
+ private:
+  ContainerLayer() {};
+  virtual ~ContainerLayer() {};
+
+  DISALLOW_COPY_AND_ASSIGN(ContainerLayer);
+};
+
+scoped_refptr<cc::Layer> ContainerLayer::Create() {
+  return make_scoped_refptr(new ContainerLayer());
+}
+
+void ContainerLayer::ForceToCommit() {
+  SetNeedsCommit();
+}
+
 }  // namespace
 
 PepperCompositorHost::LayerData::LayerData(
@@ -134,12 +156,6 @@ PepperCompositorHost::PepperCompositorHost(
     : ResourceHost(host->GetPpapiHost(), instance, resource),
       bound_instance_(NULL),
       weak_factory_(this) {
-  layer_ = cc::Layer::Create();
-  // TODO(penghuang): SetMasksToBounds() can be expensive if the layer is
-  // transformed. Possibly better could be to explicitly clip the child layers
-  // (by modifying their bounds).
-  layer_->SetMasksToBounds(true);
-  layer_->SetIsDrawable(true);
 }
 
 PepperCompositorHost::~PepperCompositorHost() {
@@ -157,7 +173,18 @@ bool PepperCompositorHost::BindToInstance(
   if (bound_instance_ && new_instance)
     return false;  // Can't change a bound device.
   bound_instance_ = new_instance;
+  layer_ = NULL;
+  layers_.clear();
+  if (bound_instance_) {
+    layer_ = ContainerLayer::Create();
+    // TODO(penghuang): SetMasksToBounds() can be expensive if the layer is
+    // transformed. Possibly better could be to explicitly clip the child layers
+    // (by modifying their bounds).
+    layer_->SetMasksToBounds(true);
+    layer_->SetIsDrawable(true);
+  }
   return true;
+
 }
 
 void PepperCompositorHost::ViewInitiatedPaint() {
@@ -366,6 +393,10 @@ int32_t PepperCompositorHost::OnHostMsgCommitLayers(
       layers_.push_back(LayerData(cc_layer, *pp_layer));
   }
 
+  // We need force to commit on the parent layer, so the ViewInitiatedPaint()
+  // will be always called, even if all layers are not changed from previous
+  // CommitLayers() call.
+  (static_cast<ContainerLayer*>(layer_.get()))->ForceToCommit();
   return PP_OK_COMPLETIONPENDING;
 }