Add optimization for CHROMIUM_subscribe_uniform extension.

content/public/browser/render_process_host.h

Index: content/public/browser/render_process_host.h
diff --git a/content/public/browser/render_process_host.h b/content/public/browser/render_process_host.h
index c61299511108a58252c06537681e242abd9e03f7..752903284dbee310123faa15d1a2b773d96f8772 100644
--- a/content/public/browser/render_process_host.h
+++ b/content/public/browser/render_process_host.h
@@ -22,6 +22,10 @@ namespace base {
 class TimeDelta;
 }
 
+namespace gpu {
+union ValueState;
+}
+
 namespace content {
 class BrowserContext;
 class BrowserMessageFilter;
@@ -239,6 +243,18 @@ class CONTENT_EXPORT RenderProcessHost : public IPC::Sender,
   // Note: Do not use! Will disappear after PlzNavitate is completed.
   virtual const base::TimeTicks& GetInitTimeForNavigationMetrics() const = 0;
 
+  // Returns whether or not the CHROMIUM_subscribe_uniform WebGL extension
+  // is currently enabled
+  virtual bool SubscribeUniformEnabled() const = 0;
+
+  // Handlers for subscription target changes to update subscription_set_
+  virtual void OnAddSubscription(unsigned int target) = 0;
+  virtual void OnRemoveSubscription(unsigned int target) = 0;
+
+  // Send a new ValueState to the Gpu Service to update a subscription target
+  virtual void SendUpdateValueState(
+      unsigned int target, const gpu::ValueState& state) = 0;
+
   // Static management functions -----------------------------------------------
 
   // Flag to run the renderer in process.  This is primarily