[Reland 2] Pepper takes ownership of a mailbox before passing it to the texture layer.

ppapi/proxy/ppb_graphics_3d_proxy.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 "ppapi/proxy/ppb_graphics_3d_proxy.h"
 
 #include "base/numerics/safe_conversions.h"
 #include "build/build_config.h"
 #include "gpu/command_buffer/client/gles2_implementation.h"
 #include "gpu/command_buffer/common/command_buffer.h"
@@ skipping 87 matching lines @@
 
 gpu::CommandBuffer::State Graphics3D::WaitForGetOffsetInRange(int32_t start,
                                                               int32_t end) {
   return GetErrorState();
 }
 
 void Graphics3D::EnsureWorkVisible() {
   NOTREACHED();
 }
 
+void Graphics3D::TakeFrontBuffer() {
+  NOTREACHED();
+}
+
 gpu::CommandBuffer* Graphics3D::GetCommandBuffer() {
   return command_buffer_.get();
 }
 
 gpu::GpuControl* Graphics3D::GetGpuControl() {
   return command_buffer_.get();
 }
 
 int32_t Graphics3D::DoSwapBuffers(const gpu::SyncToken& sync_token) {
   // A valid sync token would indicate a swap buffer already happened somehow.
   DCHECK(!sync_token.HasData());
 
   gpu::gles2::GLES2Implementation* gl = gles2_impl();
   gl->SwapBuffers();
+
+  PluginDispatcher::GetForResource(this)->Send(
+      new PpapiHostMsg_PPBGraphics3D_TakeFrontBuffer(API_ID_PPB_GRAPHICS_3D,
+                                                     host_resource()));
+
   const GLuint64 fence_sync = gl->InsertFenceSyncCHROMIUM();
   gl->ShallowFlushCHROMIUM();
 
   gpu::SyncToken new_sync_token;
   gl->GenSyncTokenCHROMIUM(fence_sync, new_sync_token.GetData());
 
   IPC::Message* msg = new PpapiHostMsg_PPBGraphics3D_SwapBuffers(
       API_ID_PPB_GRAPHICS_3D, host_resource(), new_sync_token);
   msg->set_unblock(true);
   PluginDispatcher::GetForResource(this)->Send(msg);
@@ skipping 73 matching lines @@
                         OnMsgWaitForTokenInRange)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics3D_WaitForGetOffsetInRange,
                         OnMsgWaitForGetOffsetInRange)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics3D_AsyncFlush, OnMsgAsyncFlush)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics3D_CreateTransferBuffer,
                         OnMsgCreateTransferBuffer)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics3D_DestroyTransferBuffer,
                         OnMsgDestroyTransferBuffer)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics3D_SwapBuffers,
                         OnMsgSwapBuffers)
+    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics3D_TakeFrontBuffer,
+                        OnMsgTakeFrontBuffer)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics3D_EnsureWorkVisible,
                         OnMsgEnsureWorkVisible)
 #endif  // !defined(OS_NACL)
 
     IPC_MESSAGE_HANDLER(PpapiMsg_PPBGraphics3D_SwapBuffersACK,
                         OnMsgSwapBuffersACK)
     IPC_MESSAGE_UNHANDLED(handled = false)
 
   IPC_END_MESSAGE_MAP()
   // FIXME(brettw) handle bad messages!
@@ skipping 113 matching lines @@
 void PPB_Graphics3D_Proxy::OnMsgSwapBuffers(const HostResource& context,
                                             const gpu::SyncToken& sync_token) {
   EnterHostFromHostResourceForceCallback<PPB_Graphics3D_API> enter(
       context, callback_factory_,
       &PPB_Graphics3D_Proxy::SendSwapBuffersACKToPlugin, context);
   if (enter.succeeded())
     enter.SetResult(
         enter.object()->SwapBuffersWithSyncToken(enter.callback(), sync_token));
 }
 
+void PPB_Graphics3D_Proxy::OnMsgTakeFrontBuffer(const HostResource& context) {
+  EnterHostFromHostResource<PPB_Graphics3D_API> enter(context);
+  if (enter.succeeded())
+    enter.object()->TakeFrontBuffer();
+}
+
 void PPB_Graphics3D_Proxy::OnMsgEnsureWorkVisible(const HostResource& context) {
   EnterHostFromHostResource<PPB_Graphics3D_API> enter(context);
   if (enter.succeeded())
     enter.object()->EnsureWorkVisible();
 }
 #endif  // !defined(OS_NACL)
 
 void PPB_Graphics3D_Proxy::OnMsgSwapBuffersACK(const HostResource& resource,
                                               int32_t pp_error) {
   EnterPluginFromHostResource<PPB_Graphics3D_API> enter(resource);
   if (enter.succeeded())
     static_cast<Graphics3D*>(enter.object())->SwapBuffersACK(pp_error);
 }
 
 #if !defined(OS_NACL)
 void PPB_Graphics3D_Proxy::SendSwapBuffersACKToPlugin(
     int32_t result,
     const HostResource& context) {
   dispatcher()->Send(new PpapiMsg_PPBGraphics3D_SwapBuffersACK(
       API_ID_PPB_GRAPHICS_3D, context, result));
 }
 #endif  // !defined(OS_NACL)
 
 }  // namespace proxy
 }  // namespace ppapi