Add subscribeUniform extension pipeline

gpu/command_buffer/client/gles2_implementation.cc

Index: gpu/command_buffer/client/gles2_implementation.cc
diff --git a/gpu/command_buffer/client/gles2_implementation.cc b/gpu/command_buffer/client/gles2_implementation.cc
index 96a71fc4f18fc899c83efe77bc75b55a94dee6c1..d4b9374e614bab451cae595c2a5e01fb677f4bdf 100644
--- a/gpu/command_buffer/client/gles2_implementation.cc
+++ b/gpu/command_buffer/client/gles2_implementation.cc
@@ -973,6 +973,17 @@ void GLES2Implementation::BindUniformLocationCHROMIUM(
   CheckGLError();
 }
 
+void GLES2Implementation::SubscribeUniformCHROMIUM(GLenum target,
+                                                   const GLchar* name) {
+  GPU_CLIENT_SINGLE_THREAD_CHECK();
+  GPU_CLIENT_LOG("[" << GetLogPrefix() << "] SubscribeUniformCHROMIUM("
+                     << target << ", " << name << ")");
+  SetBucketAsString(kResultBucketId, name);
+  helper_->SubscribeUniformCHROMIUM(target, kResultBucketId);
+  helper_->SetBucketSize(kResultBucketId, 0);
+  CheckGLError();
+}
+
 void GLES2Implementation::GetVertexAttribPointerv(
     GLuint index, GLenum pname, void** ptr) {
   GPU_CLIENT_SINGLE_THREAD_CHECK();