Make stream_id internal to StreamTextureHost.

content/renderer/gpu/stream_texture_host_android.h

Index: content/renderer/gpu/stream_texture_host_android.h
diff --git a/content/renderer/gpu/stream_texture_host_android.h b/content/renderer/gpu/stream_texture_host_android.h
index 06fcf0f3ec6377216d21993007def885761b4e40..6dc480b04eafaa365a2bee448e95546a917dbf9a 100644
--- a/content/renderer/gpu/stream_texture_host_android.h
+++ b/content/renderer/gpu/stream_texture_host_android.h
@@ -13,6 +13,10 @@
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_message.h"
 
+namespace base {
+class UnguessableToken;
+}
+
 namespace gfx {
 class Size;
 }
@@ -29,7 +33,8 @@ namespace content {
 // StreamTextureProxy.
 class StreamTextureHost : public IPC::Listener {
  public:
-  explicit StreamTextureHost(scoped_refptr<gpu::GpuChannelHost> channel);
+  explicit StreamTextureHost(scoped_refptr<gpu::GpuChannelHost> channel,
+                             int32_t route_id);
   ~StreamTextureHost() override;
 
   // Listener class that is listening to the stream texture updates. It is
@@ -40,17 +45,22 @@ class StreamTextureHost : public IPC::Listener {
     virtual ~Listener() {}
   };
 
-  bool BindToCurrentThread(int32_t stream_id, Listener* listener);
+  bool BindToCurrentThread(Listener* listener);
 
   // IPC::Channel::Listener implementation:
   bool OnMessageReceived(const IPC::Message& message) override;
   void OnChannelError() override;
 
+  void EstablishPeer(int player_id, int frame_id);
+  void SetStreamTextureSize(const gfx::Size& size);
+  void ForwardStreamTextureForSurfaceRequest(
+      const base::UnguessableToken& request_token);
+
  private:
   // Message handlers:
   void OnFrameAvailable();
 
-  int stream_id_;
+  int32_t route_id_;
   Listener* listener_;
   scoped_refptr<gpu::GpuChannelHost> channel_;
   base::WeakPtrFactory<StreamTextureHost> weak_ptr_factory_;