Convert ppapi/shared to use TrackedCallback.

ppapi/shared_impl/ppb_graphics_3d_shared.cc

Index: ppapi/shared_impl/ppb_graphics_3d_shared.cc
diff --git a/ppapi/shared_impl/ppb_graphics_3d_shared.cc b/ppapi/shared_impl/ppb_graphics_3d_shared.cc
index 9e0c15515e7774386f613c9d27107255a4a6b7d3..2464a1edee647a65006a400cdd8f36ef41e3eb17 100644
--- a/ppapi/shared_impl/ppb_graphics_3d_shared.cc
+++ b/ppapi/shared_impl/ppb_graphics_3d_shared.cc
@@ -11,9 +11,14 @@
 
 namespace ppapi {
 
-PPB_Graphics3D_Shared::PPB_Graphics3D_Shared()
-    : transfer_buffer_id_(-1),
-      swap_callback_(PP_BlockUntilComplete()) {
+PPB_Graphics3D_Shared::PPB_Graphics3D_Shared(PP_Instance instance)
+    : Resource(instance),
+      transfer_buffer_id_(-1) {
+}
+
+PPB_Graphics3D_Shared::PPB_Graphics3D_Shared(const HostResource& host_resource)
+    : Resource(host_resource),
+      transfer_buffer_id_(-1) {
 }
 
 PPB_Graphics3D_Shared::~PPB_Graphics3D_Shared() {
@@ -23,6 +28,10 @@ PPB_Graphics3D_Shared::~PPB_Graphics3D_Shared() {
   DCHECK(!gles2_impl_.get());
 }
 
+thunk::PPB_Graphics3D_API* PPB_Graphics3D_Shared::AsPPB_Graphics3D_API() {
+  return this;
+}
+
 int32_t PPB_Graphics3D_Shared::GetAttribs(int32_t* attrib_list) {
   // TODO(alokp): Implement me.
   return PP_ERROR_FAILED;
@@ -59,7 +68,7 @@ int32_t PPB_Graphics3D_Shared::SwapBuffers(PP_CompletionCallback callback) {
     return PP_ERROR_INPROGRESS;
   }
 
-  swap_callback_ = callback;
+  swap_callback_ = new TrackedCallback(this, callback);
   return DoSwapBuffers();
 }
 
@@ -82,7 +91,11 @@ void PPB_Graphics3D_Shared::UnmapTexSubImage2DCHROMIUM(const void* mem) {
 
 void PPB_Graphics3D_Shared::SwapBuffersACK(int32_t pp_error) {
   DCHECK(HasPendingSwap());
-  PP_RunAndClearCompletionCallback(&swap_callback_, pp_error);
+  TrackedCallback::ClearAndRun(&swap_callback_, pp_error);
+}
+
+bool PPB_Graphics3D_Shared::HasPendingSwap() const {
+  return !!swap_callback_.get();
 }
 
 bool PPB_Graphics3D_Shared::CreateGLES2Impl(int32 command_buffer_size,