[PPAPI] Add browser tests for compositor API

ppapi/proxy/ppb_instance_proxy.cc

Index: ppapi/proxy/ppb_instance_proxy.cc
diff --git a/ppapi/proxy/ppb_instance_proxy.cc b/ppapi/proxy/ppb_instance_proxy.cc
index 2b1a9889026c0474cb3b966871f8d0907cfe91b5..3f28b365a3154174fb2ad8eab2aaae5dc09e1314 100644
--- a/ppapi/proxy/ppb_instance_proxy.cc
+++ b/ppapi/proxy/ppb_instance_proxy.cc
@@ -215,37 +215,59 @@ PP_Bool PPB_Instance_Proxy::BindGraphics(PP_Instance instance,
                                          PP_Resource device) {
   // If device is 0, pass a null HostResource. This signals the host to unbind
   // all devices.
-  HostResource host_resource;
   PP_Resource pp_resource = 0;
+  InstanceData* data = static_cast<PluginDispatcher*>(dispatcher())->
+      GetInstanceData(instance);
+  scoped_refptr<Resource> old_compositor = data->bound_compositor;
+
   if (device) {
-    Resource* resource =
-        PpapiGlobals::Get()->GetResourceTracker()->GetResource(device);
-    if (!resource || resource->pp_instance() != instance)
+    do {
+      // Try enter device as a Graphics3D deivce.
+      EnterResourceNoLock<PPB_Graphics3D_API> enter_3d(device, false);
+      if (enter_3d.succeeded()) {
+        if (enter_3d.resource()->pp_instance() != instance)
+          return PP_FALSE;
+        data->bound_compositor = NULL;
+        pp_resource = enter_3d.resource()->host_resource().host_resource();
+        break;
+      }
+
+      // Try enter device as a Graphics2D device.
+      EnterResourceNoLock<PPB_Graphics2D_API> enter_2d(device, false);
+      if (enter_2d.succeeded()) {
+        if (enter_2d.resource()->pp_instance() != instance)
+          return PP_FALSE;
+        data->bound_compositor = NULL;
+        pp_resource = enter_2d.resource()->pp_resource();
+        break;
+      }
+
+      // Try enter device as a Compositor device.
+      EnterResourceNoLock<PPB_Compositor_API> enter_compositor(device, false);
+      if (enter_compositor.succeeded()) {
+        if (enter_compositor.resource()->pp_instance() != instance)
+          return PP_FALSE;
+        data->bound_compositor = enter_compositor.resource();
+        pp_resource = enter_compositor.resource()->pp_resource();
+        break;
+      }
+
       return PP_FALSE;
-    host_resource = resource->host_resource();
-    pp_resource = resource->pp_resource();
+    } while (false);
   } else {
-    // Passing 0 means unbinding all devices.
-    dispatcher()->Send(new PpapiHostMsg_PPBInstance_BindGraphics(
-        API_ID_PPB_INSTANCE, instance, 0));
-    return PP_TRUE;
+    data->bound_compositor = NULL;
   }
 
-  // We need to pass different resource to Graphics 2D and 3D right now.  Once
-  // 3D is migrated to the new design, we should be able to unify this.
-  EnterResourceNoLock<PPB_Compositor_API> enter_compositor(device, false);
-  EnterResourceNoLock<PPB_Graphics2D_API> enter_2d(device, false);
-  EnterResourceNoLock<PPB_Graphics3D_API> enter_3d(device, false);
-  if (enter_compositor.succeeded() || enter_2d.succeeded()) {
-    dispatcher()->Send(new PpapiHostMsg_PPBInstance_BindGraphics(
+  if (old_compositor)
+    old_compositor->AsPPB_Compositor_API()->BindToInstance(0);
+
+  if (data->bound_compositor)
+    data->bound_compositor->AsPPB_Compositor_API()->BindToInstance(instance);
+
+  dispatcher()->Send(new PpapiHostMsg_PPBInstance_BindGraphics(
         API_ID_PPB_INSTANCE, instance, pp_resource));
-    return PP_TRUE;
-  } else if (enter_3d.succeeded()) {
-    dispatcher()->Send(new PpapiHostMsg_PPBInstance_BindGraphics(
-        API_ID_PPB_INSTANCE, instance, host_resource.host_resource()));
-    return PP_TRUE;
-  }
-  return PP_FALSE;
+
+  return PP_TRUE;
 }
 
 PP_Bool PPB_Instance_Proxy::IsFullFrame(PP_Instance instance) {