Added a unique command buffer ID for command buffers.

ppapi/proxy/ppb_graphics_3d_proxy.cc

Index: ppapi/proxy/ppb_graphics_3d_proxy.cc
diff --git a/ppapi/proxy/ppb_graphics_3d_proxy.cc b/ppapi/proxy/ppb_graphics_3d_proxy.cc
index 8a8c6b7f4d3746f43b06befe10448fd26983e7e4..81b6a70c927ddbb63cd63ce8eff4f66225185659 100644
--- a/ppapi/proxy/ppb_graphics_3d_proxy.cc
+++ b/ppapi/proxy/ppb_graphics_3d_proxy.cc
@@ -56,13 +56,15 @@ Graphics3D::~Graphics3D() {
 
 bool Graphics3D::Init(gpu::gles2::GLES2Implementation* share_gles2,
                       const gpu::Capabilities& capabilities,
-                      const SerializedHandle& shared_state) {
+                      const SerializedHandle& shared_state,
+                      uint64_t command_buffer_id) {
   PluginDispatcher* dispatcher = PluginDispatcher::GetForResource(this);
   if (!dispatcher)
     return false;
 
   command_buffer_.reset(new PpapiCommandBufferProxy(
-      host_resource(), dispatcher, capabilities, shared_state));
+      host_resource(), dispatcher, capabilities, shared_state,
+      command_buffer_id));
 
   return CreateGLES2Impl(kCommandBufferSize, kTransferBufferSize,
                          share_gles2);
@@ -173,15 +175,19 @@ PP_Resource PPB_Graphics3D_Proxy::CreateProxyResource(
   HostResource result;
   gpu::Capabilities capabilities;
   ppapi::proxy::SerializedHandle shared_state;
+  uint64_t command_buffer_id = 0;
   dispatcher->Send(new PpapiHostMsg_PPBGraphics3D_Create(API_ID_PPB_GRAPHICS_3D,
-        instance, share_host, attribs, &result, &capabilities, &shared_state));
+        instance, share_host, attribs, &result, &capabilities, &shared_state,
+        &command_buffer_id));
 
   if (result.is_null())
     return 0;
 
   scoped_refptr<Graphics3D> graphics_3d(new Graphics3D(result));
-  if (!graphics_3d->Init(share_gles2, capabilities, shared_state))
+  if (!graphics_3d->Init(share_gles2, capabilities, shared_state,
+                         command_buffer_id)) {
     return 0;
+  }
   return graphics_3d->GetReference();
 }
 
@@ -222,12 +228,14 @@ bool PPB_Graphics3D_Proxy::OnMessageReceived(const IPC::Message& msg) {
 }
 
 #if !defined(OS_NACL)
-void PPB_Graphics3D_Proxy::OnMsgCreate(PP_Instance instance,
-                                       HostResource share_context,
-                                       const std::vector<int32_t>& attribs,
-                                       HostResource* result,
-                                       gpu::Capabilities* capabilities,
-                                       SerializedHandle* shared_state) {
+void PPB_Graphics3D_Proxy::OnMsgCreate(
+    PP_Instance instance,
+    HostResource share_context,
+    const std::vector<int32_t>& attribs,
+    HostResource* result,
+    gpu::Capabilities* capabilities,
+    SerializedHandle* shared_state,
+    uint64* command_buffer_id) {
   shared_state->set_null_shmem();
   if (attribs.empty() ||
       attribs.back() != PP_GRAPHICS3DATTRIB_NONE ||
@@ -246,7 +254,8 @@ void PPB_Graphics3D_Proxy::OnMsgCreate(PP_Instance instance,
                                              share_context.host_resource(),
                                              &attribs.front(),
                                              capabilities,
-                                             &handle));
+                                             &handle,
+                                             command_buffer_id));
   if (!result->is_null()) {
     shared_state->set_shmem(TransportSHMHandle(dispatcher(), handle),
                             sizeof(gpu::CommandBuffer::State));