Add hints for potential overlay promotion on android.

cc/ipc/cc_param_traits_unittest.cc

Index: cc/ipc/cc_param_traits_unittest.cc
diff --git a/cc/ipc/cc_param_traits_unittest.cc b/cc/ipc/cc_param_traits_unittest.cc
index 2de580b0ef660ef71c759f3f9d42e139abfe5b04..32e86cebad6dbab30047b635720d8ba0ebefde0c 100644
--- a/cc/ipc/cc_param_traits_unittest.cc
+++ b/cc/ipc/cc_param_traits_unittest.cc
@@ -208,6 +208,7 @@ class CCParamTraitsTest : public testing::Test {
     EXPECT_EQ(a.mailbox_holder.texture_target, b.mailbox_holder.texture_target);
     EXPECT_EQ(a.mailbox_holder.sync_token, b.mailbox_holder.sync_token);
     EXPECT_EQ(a.is_overlay_candidate, b.is_overlay_candidate);
+    EXPECT_EQ(a.is_backed_by_surface_texture, b.is_backed_by_surface_texture);
   }
 };
 
@@ -576,6 +577,7 @@ TEST_F(CCParamTraitsTest, Resources) {
   arbitrary_resource1.mailbox_holder.texture_target = GL_TEXTURE_2D;
   arbitrary_resource1.mailbox_holder.sync_token = arbitrary_token1;
   arbitrary_resource1.is_overlay_candidate = true;
+  arbitrary_resource1.is_backed_by_surface_texture = true;
 
   TransferableResource arbitrary_resource2;
   arbitrary_resource2.id = 789132;
@@ -586,6 +588,7 @@ TEST_F(CCParamTraitsTest, Resources) {
   arbitrary_resource2.mailbox_holder.texture_target = GL_TEXTURE_EXTERNAL_OES;
   arbitrary_resource2.mailbox_holder.sync_token = arbitrary_token2;
   arbitrary_resource2.is_overlay_candidate = false;
+  arbitrary_resource2.is_backed_by_surface_texture = false;
 
   std::unique_ptr<RenderPass> renderpass_in = RenderPass::Create();
   renderpass_in->SetNew(RenderPassId(1, 1), gfx::Rect(), gfx::Rect(),