Plumb allow_overlay flag to parent compositor.

content/common/cc_messages_unittest.cc

Index: content/common/cc_messages_unittest.cc
diff --git a/content/common/cc_messages_unittest.cc b/content/common/cc_messages_unittest.cc
index e256bcfbb4ed0cd6b7fc92b01d8cedb90ae10e00..73b1a0836344b152e09d179258776bcf54089cd6 100644
--- a/content/common/cc_messages_unittest.cc
+++ b/content/common/cc_messages_unittest.cc
@@ -215,6 +215,7 @@ class CCMessagesTest : public testing::Test {
     }
     EXPECT_EQ(a.mailbox_holder.texture_target, b.mailbox_holder.texture_target);
     EXPECT_EQ(a.mailbox_holder.sync_point, b.mailbox_holder.sync_point);
+    EXPECT_EQ(a.allow_overlay, b.allow_overlay);
   }
 };
 
@@ -655,6 +656,7 @@ TEST_F(CCMessagesTest, Resources) {
   arbitrary_resource1.mailbox_holder.mailbox.SetName(arbitrary_mailbox1);
   arbitrary_resource1.mailbox_holder.texture_target = GL_TEXTURE_2D;
   arbitrary_resource1.mailbox_holder.sync_point = arbitrary_uint1;
+  arbitrary_resource1.allow_overlay = true;
 
   TransferableResource arbitrary_resource2;
   arbitrary_resource2.id = 789132;
@@ -664,6 +666,7 @@ TEST_F(CCMessagesTest, Resources) {
   arbitrary_resource2.mailbox_holder.mailbox.SetName(arbitrary_mailbox2);
   arbitrary_resource2.mailbox_holder.texture_target = GL_TEXTURE_EXTERNAL_OES;
   arbitrary_resource2.mailbox_holder.sync_point = arbitrary_uint2;
+  arbitrary_resource2.allow_overlay = false;
 
   scoped_ptr<RenderPass> renderpass_in = RenderPass::Create();
   renderpass_in->SetNew(