[Reland 1] Pepper takes ownership of a mailbox before passing it to the texture layer.

gpu/ipc/service/gpu_command_buffer_stub.cc

Index: gpu/ipc/service/gpu_command_buffer_stub.cc
diff --git a/gpu/ipc/service/gpu_command_buffer_stub.cc b/gpu/ipc/service/gpu_command_buffer_stub.cc
index 6d05eb53faee17c4bfaeaeb2d52b838ee8f6ea2a..7f4d112a4f542a90d29cf79d325a6b61e534a034 100644
--- a/gpu/ipc/service/gpu_command_buffer_stub.cc
+++ b/gpu/ipc/service/gpu_command_buffer_stub.cc
@@ -295,8 +295,9 @@ bool GpuCommandBufferStub::OnMessageReceived(const IPC::Message& message) {
                                     OnInitialize);
     IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuCommandBufferMsg_SetGetBuffer,
                                     OnSetGetBuffer);
-    IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_ProduceFrontBuffer,
-                        OnProduceFrontBuffer);
+    IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_TakeFrontBuffer, OnTakeFrontBuffer);
+    IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_ReturnFrontBuffer,
+                        OnReturnFrontBuffer);
     IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuCommandBufferMsg_WaitForTokenInRange,
                                     OnWaitForTokenInRange);
     IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuCommandBufferMsg_WaitForGetOffsetInRange,
@@ -306,6 +307,8 @@ bool GpuCommandBufferStub::OnMessageReceived(const IPC::Message& message) {
                         OnRegisterTransferBuffer);
     IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_DestroyTransferBuffer,
                         OnDestroyTransferBuffer);
+    IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_WaitSyncToken,
+                        OnWaitSyncToken)
     IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_SignalSyncToken,
                         OnSignalSyncToken)
     IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_SignalQuery,
@@ -711,14 +714,19 @@ void GpuCommandBufferStub::OnSetGetBuffer(int32_t shm_id,
   Send(reply_message);
 }
 
-void GpuCommandBufferStub::OnProduceFrontBuffer(const Mailbox& mailbox) {
-  TRACE_EVENT0("gpu", "GpuCommandBufferStub::OnProduceFrontBuffer");
+void GpuCommandBufferStub::OnTakeFrontBuffer(const Mailbox& mailbox) {
+  TRACE_EVENT0("gpu", "GpuCommandBufferStub::OnTakeFrontBuffer");
   if (!decoder_) {
-    LOG(ERROR) << "Can't produce front buffer before initialization.";
+    LOG(ERROR) << "Can't take front buffer before initialization.";
     return;
   }
 
-  decoder_->ProduceFrontBuffer(mailbox);
+  decoder_->TakeFrontBuffer(mailbox);
+}
+
+void GpuCommandBufferStub::OnReturnFrontBuffer(const Mailbox& mailbox,
+                                               bool is_lost) {
+  decoder_->ReturnFrontBuffer(mailbox, is_lost);
 }
 
 void GpuCommandBufferStub::OnParseError() {
@@ -883,6 +891,11 @@ void GpuCommandBufferStub::PullTextureUpdates(
   }
 }
 
+void GpuCommandBufferStub::OnWaitSyncToken(const SyncToken& sync_token) {
+  OnWaitFenceSync(sync_token.namespace_id(), sync_token.command_buffer_id(),
+                  sync_token.release_count());
+}
+
 void GpuCommandBufferStub::OnSignalSyncToken(const SyncToken& sync_token,
                                              uint32_t id) {
   scoped_refptr<SyncPointClientState> release_state =