Layout test for validating GLinfo on webglcontextcreationerror.

Source/core/html/canvas/WebGLRenderingContext.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 69 matching lines @@
         canvas->dispatchEvent(WebGLContextEvent::create(EventTypeNames::webglcontextcreationerror, false, true, "Web page was not allowed to create a WebGL context."));
         return nullptr;
     }
 
     WebGLContextAttributes attributes = toWebGLContextAttributes(attrs);
     blink::WebGraphicsContext3D::Attributes wgc3dAttributes = toWebGraphicsContext3DAttributes(attributes, document.topDocument().url().string(), settings, 1);
     blink::WebGLInfo glInfo;
     OwnPtr<blink::WebGraphicsContext3D> context = adoptPtr(blink::Platform::current()->createOffscreenGraphicsContext3D(wgc3dAttributes, 0, &glInfo));
     if (!context || shouldFailContextCreationForTesting) {
         shouldFailContextCreationForTesting = false;
-        String statusMessage("Could not create a WebGL context for VendorInfo = ");
-        statusMessage.append(glInfo.vendorInfo);
-        statusMessage.append(", RendererInfo = ");
-        statusMessage.append(glInfo.rendererInfo);
-        statusMessage.append(", DriverInfo = ");
-        statusMessage.append(glInfo.driverVersion);
-        statusMessage.append(".");
+        String statusMessage;
+        if (!glInfo.contextInfoCollectionFailure.isEmpty()) {
+            statusMessage.append("Could not create a WebGL context.");

[philipj_slow, 2014/12/27 09:13:14]

Add a space at the end of this string or assert that
glInfo.contextInfoCollectionFailure begins with a space.

[sivag, 2014/12/29 13:08:53]

Done.

+            statusMessage.append(glInfo.contextInfoCollectionFailure);
+        } else {
+            statusMessage.append("Could not create a WebGL context");
+            if (!glInfo.vendorInfo.isEmpty()) {
+                statusMessage.append(" VendorInfo = ");
+                statusMessage.append(glInfo.vendorInfo);
+            } else {
+                statusMessage.append(" VendorInfo = Not Available");
+            }
+            if (!glInfo.rendererInfo.isEmpty()) {
+                statusMessage.append(", RendererInfo = ");
+                statusMessage.append(glInfo.rendererInfo);
+            } else {
+                statusMessage.append(", RendererInfo = Not Available");
+            }
+            if (!glInfo.driverVersion.isEmpty()) {
+                statusMessage.append(", DriverInfo = ");
+                statusMessage.append(glInfo.driverVersion);
+            } else {
+                statusMessage.append(", DriverInfo = Not Available");
+            }
+            statusMessage.append(".");
+        }
         canvas->dispatchEvent(WebGLContextEvent::create(EventTypeNames::webglcontextcreationerror, false, true, statusMessage));
         return nullptr;
     }
 
     OwnPtr<Extensions3DUtil> extensionsUtil = Extensions3DUtil::create(context.get());
     if (!extensionsUtil)
         return nullptr;
     if (extensionsUtil->supportsExtension("GL_EXT_debug_marker"))
         context->pushGroupMarkerEXT("WebGLRenderingContext");
 
@@ skipping 75 matching lines @@
     visitor->trace(m_webglDepthTexture);
     WebGLRenderingContextBase::trace(visitor);
 }
 
 void WebGLRenderingContext::forceNextWebGLContextCreationToFail()
 {
     shouldFailContextCreationForTesting = true;
 }
 
 } // namespace blink