Add gpu::MailboxHolder to hold state for a gpu::Mailbox

cc/trees/layer_tree_host_perftest.cc

Index: cc/trees/layer_tree_host_perftest.cc
diff --git a/cc/trees/layer_tree_host_perftest.cc b/cc/trees/layer_tree_host_perftest.cc
index 5f15ca6e156c34dc96df2837d9c4843da346c818..f3a3ffbcd8de42a040e4caaf53abedf9feb95ded 100644
--- a/cc/trees/layer_tree_host_perftest.cc
+++ b/cc/trees/layer_tree_host_perftest.cc
@@ -243,7 +243,7 @@ TEST_F(ScrollingLayerTreePerfTest, LongScrollablePageThreadedImplSide) {
   RunTestWithImplSidePainting();
 }
 
-static void EmptyReleaseCallback(unsigned sync_point, bool lost_resource) {}
+static void EmptyReleaseCallback(uint32 sync_point, bool lost_resource) {}
 
 // Simulates main-thread scrolling on each frame.
 class BrowserCompositorInvalidateLayerTreePerfTest
@@ -272,7 +272,7 @@ class BrowserCompositorInvalidateLayerTreePerfTest
     memcpy(gpu_mailbox.name, name, strlen(name) + 1);
     scoped_ptr<SingleReleaseCallback> callback = SingleReleaseCallback::Create(
         base::Bind(&EmptyReleaseCallback));
-    TextureMailbox mailbox(gpu_mailbox, next_sync_point_);
+    TextureMailbox mailbox(gpu_mailbox, GL_TEXTURE_2D, next_sync_point_);
     next_sync_point_++;
 
     tab_contents_->SetTextureMailbox(mailbox, callback.Pass());