ozone: gpu: Add plumbing for platform-specific gpu messaging

content/browser/gpu/gpu_process_host.h

Index: content/browser/gpu/gpu_process_host.h
diff --git a/content/browser/gpu/gpu_process_host.h b/content/browser/gpu/gpu_process_host.h
index 079b549a597bf93024f3e52ca2ee6b923cf0251e..a4030c32fb0e953fcd8c422f3965995301907265 100644
--- a/content/browser/gpu/gpu_process_host.h
+++ b/content/browser/gpu/gpu_process_host.h
@@ -10,6 +10,7 @@
 #include <set>
 #include <string>
 
+#include "base/atomic_sequence_num.h"
 #include "base/callback.h"
 #include "base/containers/hash_tables.h"
 #include "base/memory/weak_ptr.h"
@@ -151,6 +152,8 @@ class GpuProcessHost : public BrowserChildProcessHostDelegate,
   void EndFrameSubscription(int surface_id);
   void LoadedShader(const std::string& key, const std::string& data);
 
+  int32 GenerateRouteID();

[rjkroege, 2014/06/16 21:38:49]

does this need to be public? I missed seeing it being called anywhere outside of
gpu_process_host.cc

+
  private:
   static bool ValidateHost(GpuProcessHost* host);
 
@@ -279,6 +282,8 @@ class GpuProcessHost : public BrowserChildProcessHostDelegate,
       SurfaceRefMap;
   SurfaceRefMap surface_refs_;
 
+  base::AtomicSequenceNumber next_route_id_;
+
   DISALLOW_COPY_AND_ASSIGN(GpuProcessHost);
 };