[WebGL-blink] Return meaningful information in WebGL context creation error message

public/platform/Platform.h

Index: public/platform/Platform.h
diff --git a/public/platform/Platform.h b/public/platform/Platform.h
index c319e30c3ab10f33258b52f0ef4015c0d13169d6..ff881cbc8b72edd6270a03b07a187dbd8c663fa9 100644
--- a/public/platform/Platform.h
+++ b/public/platform/Platform.h
@@ -557,7 +557,7 @@ public:
     // May return null if GPU is not supported.
     // Returns newly allocated and initialized offscreen WebGraphicsContext3D instance.
     // Passing an existing context to shareContext will create the new context in the same share group as the passed context.
-    virtual WebGraphicsContext3D* createOffscreenGraphicsContext3D(const WebGraphicsContext3D::Attributes&, WebGraphicsContext3D* shareContext) { return 0; }
+    virtual WebGraphicsContext3D* createOffscreenGraphicsContext3D(const WebGraphicsContext3D::Attributes&, WebGraphicsContext3D* shareContext, WebGLInfo& glInfo) { return 0; }

[piman, 2014/10/10 20:23:06]

Please pass output params by pointer, not (non-const) references.

[Ken Russell (switch to Gerrit), 2014/10/10 20:47:38]

Also, figure out a way to avoid temporarily breaking the override in Chromium,
whether this means temporarily overriding both the old and new signature in
Chromium, or temporarily having both signatures as virtual in Blink and having
the new one temporarily delegate to the old one.

[sivag, 2014/10/27 13:33:51]

Done.

     virtual WebGraphicsContext3D* createOffscreenGraphicsContext3D(const WebGraphicsContext3D::Attributes&) { return 0; }
 
     // Returns a newly allocated and initialized offscreen context provider. The provider may return a null