Add a shallow command buffer flush that doesn't glFlush

gpu/command_buffer/client/gles2_implementation.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // A class to emulate GLES2 over command buffers.
 
 #include "../client/gles2_implementation.h"
 
 #include <algorithm>
 #include <map>
@@ skipping 1037 matching lines @@
 void GLES2Implementation::Flush() {
   GPU_CLIENT_SINGLE_THREAD_CHECK();
   GPU_CLIENT_LOG("[" << this << "] glFlush()");
   // Insert the cmd to call glFlush
   helper_->Flush();
   // Flush our command buffer
   // (tell the service to execute up to the flush cmd.)
   helper_->CommandBufferHelper::Flush();
 }
 
+void GLES2Implementation::ShallowFlushCHROMIUM() {
+  GPU_CLIENT_SINGLE_THREAD_CHECK();
+  GPU_CLIENT_LOG("[" << this << "] glShallowFlushCHROMIUM()");
+  // Flush our command buffer
+  // (tell the service to execute up to the flush cmd.)
+  helper_->CommandBufferHelper::Flush();
+}
+
 void GLES2Implementation::Finish() {
   GPU_CLIENT_SINGLE_THREAD_CHECK();
   FinishHelper();
 }
 
 void GLES2Implementation::FinishHelper() {
   GPU_CLIENT_LOG("[" << this << "] glFinish()");
   TRACE_EVENT0("gpu", "GLES2::Finish");
   // Insert the cmd to call glFinish
   helper_->Finish();
@@ skipping 1045 matching lines @@
   const char* result = NULL;
   // Clears the bucket so if the command fails nothing will be in it.
   helper_->SetBucketSize(kResultBucketId, 0);
   helper_->GetString(name, kResultBucketId);
   std::string str;
   if (GetBucketAsString(kResultBucketId, &str)) {
     // Adds extensions implemented on client side only.
     switch (name) {
       case GL_EXTENSIONS:
         str += std::string(str.empty() ? "" : " ") +
+            "GL_CHROMIUM_flipy "
             "GL_CHROMIUM_map_sub "
-            "GL_CHROMIUM_flipy "
+            "GL_CHROMIUM_shallow_flush "
             "GL_EXT_unpack_subimage";
         break;
       default:
         break;
     }
 
     // Because of WebGL the extensions can change. We have to cache each unique
     // result since we don't know when the client will stop referring to a
     // previous one it queries.
     GLStringMap::iterator it = gl_strings_.find(name);
@@ skipping 1154 matching lines @@
   helper_->GenMailboxCHROMIUM(kResultBucketId);
 
   std::vector<GLbyte> result;
   GetBucketContents(kResultBucketId, &result);
 
   std::copy(result.begin(), result.end(), mailbox);
 }
 
 }  // namespace gles2
 }  // namespace gpu