[ozone] Temporary workaround for GPU support message filter not being installed early enough.

ui/ozone/platform/dri/dri_gpu_platform_support.cc

Index: ui/ozone/platform/dri/dri_gpu_platform_support.cc
diff --git a/ui/ozone/platform/dri/dri_gpu_platform_support.cc b/ui/ozone/platform/dri/dri_gpu_platform_support.cc
index af063d43440a7eca24c6bb5c00b9389faa1473e2..af85fa4821138f06f28ba01f5855c2184290e2b3 100644
--- a/ui/ozone/platform/dri/dri_gpu_platform_support.cc
+++ b/ui/ozone/platform/dri/dri_gpu_platform_support.cc
@@ -34,7 +34,8 @@ class DriGpuPlatformSupportMessageFilter : public IPC::MessageFilter {
         main_thread_listener_(main_thread_listener),
         main_thread_task_runner_(base::ThreadTaskRunnerHandle::Get()),
         pending_main_thread_operations_(0),
-        cursor_animating_(false) {}
+        cursor_animating_(false),
+        start_on_main_(true) {}
 
   void OnFilterAdded(IPC::Sender* sender) override {
     io_thread_task_runner_ = base::ThreadTaskRunnerHandle::Get();
@@ -59,7 +60,8 @@ class DriGpuPlatformSupportMessageFilter : public IPC::MessageFilter {
     bool cursor_was_animating = cursor_animating_;
     UpdateAnimationState(message);
     if (cursor_state_message || pending_main_thread_operations_ ||
-        cursor_animating_ || cursor_was_animating) {
+        cursor_animating_ || cursor_was_animating || start_on_main_) {
+      start_on_main_ = false;
       pending_main_thread_operations_++;
 
       base::Closure main_thread_message_handler =
@@ -151,6 +153,12 @@ class DriGpuPlatformSupportMessageFilter : public IPC::MessageFilter {
   scoped_refptr<base::SingleThreadTaskRunner> io_thread_task_runner_;
   int32 pending_main_thread_operations_;
   bool cursor_animating_;
+  // The filter is not installed early enough, so some messages may
+  // get routed to main thread. Once we get our first message on io, send it
+  // to main to ensure all prior main thread operations are finished before we
+  // continue on io.
+  // TODO: remove this once filter is properly installed.
+  bool start_on_main_;
 };
 }