Limit the number of WebGL contexts that are active at any given time

Source/WebCore/html/canvas/WebGLRenderingContext.h

Index: Source/WebCore/html/canvas/WebGLRenderingContext.h
diff --git a/Source/WebCore/html/canvas/WebGLRenderingContext.h b/Source/WebCore/html/canvas/WebGLRenderingContext.h
index b7160f7d9157db3afb24c3222bf22e3b4cd7a155..6e565cff317ae6d492d2b49e01286ef842c94d65 100644
--- a/Source/WebCore/html/canvas/WebGLRenderingContext.h
+++ b/Source/WebCore/html/canvas/WebGLRenderingContext.h
@@ -324,6 +324,8 @@ public:
     virtual bool hasPendingActivity() const;
     virtual void stop();
 
+    static void forceLostOldestContext();

[Ken Russell (switch to Gerrit), 2013/04/16 02:57:52]

The naming convention is getting confusing; I suggest
"forciblyLoseOldestContext" for this, even though it doesn't quite match the
other related methods (which could perhaps be renamed).

+
   private:
     friend class EXTDrawBuffers;
     friend class WebGLFramebuffer;
@@ -782,6 +784,13 @@ public:
     bool supportsDrawBuffers();
 
     friend class WebGLStateRestorer;
+
+    static Vector<WebGLRenderingContext*>& activeContexts();
+    static Vector<WebGLRenderingContext*>& inactiveContexts();
+
+    static void activateContext(WebGLRenderingContext*);
+    static void deactivateContext(WebGLRenderingContext*, bool addToInactiveList);
+    static void removeContext(WebGLRenderingContext*);

[Ken Russell (switch to Gerrit), 2013/04/16 02:57:52]

"removeContext" is too generic a name. "willDestroyContext" might be better.

 };
 
 } // namespace WebCore