Make async waiter explicit MojoGLES2CreateContext param

mojo/gles2/gles2_impl.cc

Index: mojo/gles2/gles2_impl.cc
diff --git a/mojo/gles2/gles2_impl.cc b/mojo/gles2/gles2_impl.cc
index 59b427846589649b4cc59b963646a7abc99da2c4..a77405f7a91690c56037f963cb56292a52b66d92 100644
--- a/mojo/gles2/gles2_impl.cc
+++ b/mojo/gles2/gles2_impl.cc
@@ -4,6 +4,8 @@
 
 #include "mojo/public/c/gles2/gles2.h"
 
+#include "base/lazy_instance.h"
+#include "base/threading/thread_local.h"
 #include "gpu/command_buffer/client/gles2_interface.h"
 #include "mojo/gles2/gles2_context.h"
 
@@ -11,34 +13,20 @@ using mojo::gles2::GLES2Context;
 
 namespace {
 
-const MojoAsyncWaiter* g_async_waiter = NULL;
-gpu::gles2::GLES2Interface* g_gpu_interface = NULL;
+base::LazyInstance<base::ThreadLocalPointer<gpu::gles2::GLES2Interface> >::Leaky
+    g_gpu_interface;
 
 }  // namespace
 
 extern "C" {
-
-void MojoGLES2Initialize(const MojoAsyncWaiter* async_waiter) {
-  DCHECK(!g_async_waiter);
-  DCHECK(async_waiter);
-  g_async_waiter = async_waiter;
-}
-
-void MojoGLES2Terminate() {
-  DCHECK(g_async_waiter);
-  g_async_waiter = NULL;
-}
-
-MojoGLES2Context MojoGLES2CreateContext(
-    MojoHandle handle,
-    MojoGLES2ContextLost lost_callback,
-    void* closure) {
+MojoGLES2Context MojoGLES2CreateContext(MojoHandle handle,
+                                        MojoGLES2ContextLost lost_callback,
+                                        void* closure,
+                                        const MojoAsyncWaiter* async_waiter) {
   mojo::MessagePipeHandle mph(handle);
   mojo::ScopedMessagePipeHandle scoped_handle(mph);
-  scoped_ptr<GLES2Context> client(new GLES2Context(g_async_waiter,
-                                                   scoped_handle.Pass(),
-                                                   lost_callback,
-                                                   closure));
+  scoped_ptr<GLES2Context> client(new GLES2Context(
+      async_waiter, scoped_handle.Pass(), lost_callback, closure));
   if (!client->Initialize())
     client.reset();
   return client.release();
@@ -55,12 +43,12 @@ void MojoGLES2MakeCurrent(MojoGLES2Context context) {
     interface = client->interface();
     DCHECK(interface);
   }
-  g_gpu_interface = interface;
+  g_gpu_interface.Get().Set(interface);
 }
 
 void MojoGLES2SwapBuffers() {
-  assert(g_gpu_interface);
-  g_gpu_interface->SwapBuffers();
+  DCHECK(g_gpu_interface.Get().Get());
+  g_gpu_interface.Get().Get()->SwapBuffers();
 }
 
 void* MojoGLES2GetGLES2Interface(MojoGLES2Context context) {
@@ -71,10 +59,10 @@ void* MojoGLES2GetContextSupport(MojoGLES2Context context) {
   return static_cast<GLES2Context*>(context)->context_support();
 }
 
-#define VISIT_GL_CALL(Function, ReturnType, PARAMETERS, ARGUMENTS)  \
-  ReturnType gl##Function PARAMETERS {                              \
-    assert(g_gpu_interface);                                        \
-    return g_gpu_interface->Function ARGUMENTS;                     \
+#define VISIT_GL_CALL(Function, ReturnType, PARAMETERS, ARGUMENTS) \
+  ReturnType gl##Function PARAMETERS {                             \
+    DCHECK(g_gpu_interface.Get().Get());                           \
+    return g_gpu_interface.Get().Get()->Function ARGUMENTS;        \
   }
 #include "mojo/public/c/gles2/gles2_call_visitor_autogen.h"
 #undef VISIT_GL_CALL