Added a unique command buffer ID for command buffers.

ppapi/proxy/ppb_graphics_3d_proxy.h

Index: ppapi/proxy/ppb_graphics_3d_proxy.h
diff --git a/ppapi/proxy/ppb_graphics_3d_proxy.h b/ppapi/proxy/ppb_graphics_3d_proxy.h
index 230cff3cc3cb81d04ad205e8511a76bc34657a10..ffe94283f5a584ed8f780103516e0ebc611e25df 100644
--- a/ppapi/proxy/ppb_graphics_3d_proxy.h
+++ b/ppapi/proxy/ppb_graphics_3d_proxy.h
@@ -24,6 +24,7 @@ struct Capabilities;
 namespace ppapi {
 
 class HostResource;
+struct CommandBufferIDPair;
 
 namespace proxy {
 
@@ -37,7 +38,9 @@ class PPAPI_PROXY_EXPORT Graphics3D : public PPB_Graphics3D_Shared {
 
   bool Init(gpu::gles2::GLES2Implementation* share_gles2,
             const gpu::Capabilities& capabilities,
-            const SerializedHandle& shared_state);
+            const SerializedHandle& shared_state,
+            gpu::CommandBufferNamespace namespace_id,
+            uint64_t command_buffer_id);
 
   // Graphics3DTrusted API. These are not implemented in the proxy.
   PP_Bool SetGetBuffer(int32_t shm_id) override;
@@ -85,7 +88,8 @@ class PPB_Graphics3D_Proxy : public InterfaceProxy {
                    const std::vector<int32_t>& attribs,
                    HostResource* result,
                    gpu::Capabilities* capabilities,
-                   SerializedHandle* handle);
+                   SerializedHandle* handle,
+                   CommandBufferIDPair* id_pair);
   void OnMsgSetGetBuffer(const HostResource& context,
                          int32 id);
   void OnMsgWaitForTokenInRange(const HostResource& context,