Add optimization for CHROMIUM_subscribe_uniform extension.

content/common/gpu/gpu_command_buffer_stub.h

Index: content/common/gpu/gpu_command_buffer_stub.h
diff --git a/content/common/gpu/gpu_command_buffer_stub.h b/content/common/gpu/gpu_command_buffer_stub.h
index 2fe5daf2104d94c785b8f069e604a5c535a84165..34701b7db7c70b0aa8b7aa3bdd239321bc5a7c5c 100644
--- a/content/common/gpu/gpu_command_buffer_stub.h
+++ b/content/common/gpu/gpu_command_buffer_stub.h
@@ -36,6 +36,7 @@ struct Mailbox;
 class ValueStateMap;
 namespace gles2 {
 class MailboxManager;
+class SubscriptionRefSet;
 }
 }
 
@@ -70,6 +71,7 @@ class GpuCommandBufferStub
       GpuCommandBufferStub* share_group,
       const gfx::GLSurfaceHandle& handle,
       gpu::gles2::MailboxManager* mailbox_manager,
+      gpu::gles2::SubscriptionRefSet* subscription_ref_set,
       gpu::ValueStateMap* pending_valuebuffer_state,
       const gfx::Size& size,
       const gpu::gles2::DisallowedFeatures& disallowed_features,