Start of hardware overlay support in CC with Ubercompositor.

cc/quads/render_pass.cc

Index: cc/quads/render_pass.cc
diff --git a/cc/quads/render_pass.cc b/cc/quads/render_pass.cc
index cdf3b94c3c5635ec40cb6809e0c7914fd8a938c4..9491fc06254b7d49237b4a82d8ac20e78b5c132d 100644
--- a/cc/quads/render_pass.cc
+++ b/cc/quads/render_pass.cc
@@ -35,14 +35,16 @@ scoped_ptr<RenderPass> RenderPass::Create(size_t num_layers) {
 
 RenderPass::RenderPass()
     : id(Id(-1, -1)),
-      has_transparent_background(true) {
+      has_transparent_background(true),
+      overlay_state(NO_OVERLAY) {
   shared_quad_state_list.reserve(kDefaultNumSharedQuadStatesToReserve);
   quad_list.reserve(kDefaultNumQuadsToReserve);
 }
 
 RenderPass::RenderPass(size_t num_layers)
     : id(Id(-1, -1)),
-      has_transparent_background(true) {
+      has_transparent_background(true),
+      overlay_state(NO_OVERLAY) {
   // Each layer usually produces one shared quad state, so the number of layers
   // is a good hint for what to reserve here.
   shared_quad_state_list.reserve(num_layers);