ozone: Add post message loop initialization hook

ui/ozone/public/ozone_platform.cc

Index: ui/ozone/public/ozone_platform.cc
diff --git a/ui/ozone/public/ozone_platform.cc b/ui/ozone/public/ozone_platform.cc
index b69bc28927d76d800321b2f58b2c26c66759d21d..0ca3e4ac1c15cd0916cb6b039d0f6d0198292c3d 100644
--- a/ui/ozone/public/ozone_platform.cc
+++ b/ui/ozone/public/ozone_platform.cc
@@ -17,6 +17,7 @@ namespace {
 
 bool g_platform_initialized_ui = false;
 bool g_platform_initialized_gpu = false;
+bool g_platform_initialized_gpu_post_main_loop = false;
 
 }
 
@@ -25,6 +26,7 @@ OzonePlatform::OzonePlatform() {
   instance_ = this;
   g_platform_initialized_ui = false;
   g_platform_initialized_gpu = false;
+  g_platform_initialized_gpu_post_main_loop = false;
 }
 
 OzonePlatform::~OzonePlatform() {
@@ -54,6 +56,18 @@ void OzonePlatform::InitializeForGPU() {
 }
 
 // static
+void OzonePlatform::InitializeForGPUPostMainLoop() {
+  CHECK(instance_ && g_platform_initialized_gpu)
+      << "OzonePlatform is not initialized";

[spang, 2015/03/31 20:58:49]

DCHECK per the style guide (it says never use CHECK except in a narrow set of
exceptions).

Probably just DCHECK(g_platform_initialized_gpu) - doesn't seem like the other
part is needed.

[vignatti (out of this project), 2015/04/01 16:26:11]

Done.

+
+  if (g_platform_initialized_gpu_post_main_loop)
+    return;
+  g_platform_initialized_gpu_post_main_loop = true;
+
+  instance_->InitializeGPUPostMainLoop();
+}
+
+// static
 OzonePlatform* OzonePlatform::GetInstance() {
   DCHECK(instance_) << "OzonePlatform is not initialized";
   return instance_;