Preliminary compositor disabling patch.

content/common/cc_messages.cc

Index: content/common/cc_messages.cc
diff --git a/content/common/cc_messages.cc b/content/common/cc_messages.cc
index 29294dba91571c7315977c609d8137bc8db5d22d..1bdfcea5621c6a4492d6d9769b73a5e864db18d0 100644
--- a/content/common/cc_messages.cc
+++ b/content/common/cc_messages.cc
@@ -292,6 +292,7 @@ void ParamTraits<cc::RenderPass>::Write(
   WriteParam(m, p.id);
   WriteParam(m, p.output_rect);
   WriteParam(m, p.damage_rect);
+  WriteParam(m, p.overlay_rect);
   WriteParam(m, p.transform_to_root_target);
   WriteParam(m, p.has_transparent_background);
   WriteParam(m, p.quad_list.size());
@@ -398,23 +399,20 @@ bool ParamTraits<cc::RenderPass>::Read(
   cc::RenderPassId id(-1, -1);
   gfx::Rect output_rect;
   gfx::Rect damage_rect;
+  gfx::Rect overlay_rect;
   gfx::Transform transform_to_root_target;
   bool has_transparent_background;
   size_t quad_list_size;
 
-  if (!ReadParam(m, iter, &id) ||
-      !ReadParam(m, iter, &output_rect) ||
-      !ReadParam(m, iter, &damage_rect) ||
+  if (!ReadParam(m, iter, &id) || !ReadParam(m, iter, &output_rect) ||
+      !ReadParam(m, iter, &damage_rect) || !ReadParam(m, iter, &overlay_rect) ||
       !ReadParam(m, iter, &transform_to_root_target) ||
       !ReadParam(m, iter, &has_transparent_background) ||
       !ReadParam(m, iter, &quad_list_size))
     return false;
 
-  p->SetAll(id,
-            output_rect,
-            damage_rect,
-            transform_to_root_target,
-            has_transparent_background);
+  p->SetAll(id, output_rect, damage_rect, overlay_rect,
+            transform_to_root_target, has_transparent_background);
 
   for (size_t i = 0; i < quad_list_size; ++i) {
     cc::DrawQuad::Material material;
@@ -502,6 +500,8 @@ void ParamTraits<cc::RenderPass>::Log(
   l->append(", ");
   LogParam(p.damage_rect, l);
   l->append(", ");
+  LogParam(p.overlay_rect, l);
+  l->append(", ");
   LogParam(p.transform_to_root_target, l);
   l->append(", ");
   LogParam(p.has_transparent_background, l);