Add the necessary plumbing mechanisms to ensure proper WebGL support inside the <browser> tag, whic…

content/renderer/pepper/pepper_platform_context_3d_impl.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.
 
 #include "content/renderer/pepper/pepper_platform_context_3d_impl.h"
 
 #include "base/bind.h"
 #include "content/common/gpu/client/gpu_channel_host.h"
 #include "content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h"
 #include "content/renderer/pepper/pepper_parent_context_provider.h"
@@ skipping 33 matching lines @@
     channel_->DestroyCommandBuffer(command_buffer_);
     command_buffer_ = NULL;
     if (channel_->WillGpuSwitchOccur(false, gfx::PreferDiscreteGpu)) {
       channel_->ForciblyCloseChannel();
     }
   }
 
   channel_ = NULL;
 }
 
-bool PlatformContext3DImpl::Init(const int32* attrib_list) {
+bool PlatformContext3DImpl::Init(const int32* attrib_list,
+                                 PlatformContext3D* share_context) {
   // Ignore initializing more than once.
   if (command_buffer_)
     return true;
 
   if (!parent_context_provider_)
     return false;
 
   RenderThreadImpl* render_thread = RenderThreadImpl::current();
   if (!render_thread)
     return false;
@@ skipping 42 matching lines @@
         // fall-through
         default:
           attribs.push_back(attr[0]);
           attribs.push_back(attr[1]);
           break;
       }
     }
     attribs.push_back(PP_GRAPHICS3DATTRIB_NONE);
   }
 
+  CommandBufferProxy* share_buffer = 0;

[piman, 2012/05/16 23:38:45]

nit: share_buffer = NULL

[(scshunt), 2012/05/17 16:55:45]

picked.

+  if (share_context) {
+    PlatformContext3DImpl* share_impl =
+      static_cast<PlatformContext3DImpl*>(share_context);

[piman, 2012/05/16 23:38:45]

nit: indent for continuation should be +4

[(scshunt), 2012/05/17 16:55:45]

picked.

+    share_buffer = share_impl->command_buffer_;
+  }
+
   command_buffer_ = channel_->CreateOffscreenCommandBuffer(
       surface_size,
-      NULL,
+      share_buffer,
       "*",
       attribs,
       GURL::EmptyGURL(),
       gpu_preference);
   if (!command_buffer_)
     return false;
 
   command_buffer_->SetChannelErrorCallback(
       base::Bind(&PlatformContext3DImpl::OnContextLost,
                  weak_ptr_factory_.GetWeakPtr()));
@@ skipping 69 matching lines @@
 void PlatformContext3DImpl::OnConsoleMessage(const std::string& msg, int id) {
   DCHECK(command_buffer_);
 
   if (!console_message_callback_.is_null())
     console_message_callback_.Run(msg, id);
 }
 
 }  // namespace content
 
 #endif  // ENABLE_GPU