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

content/renderer/renderer_blink_platform_impl.cc

Index: content/renderer/renderer_blink_platform_impl.cc
diff --git a/content/renderer/renderer_blink_platform_impl.cc b/content/renderer/renderer_blink_platform_impl.cc
index 242a5950a3c6cca3b1b844a75efd806d3955dfcf..0152cd177122dacc554fa2d4446570022ec67736 100644
--- a/content/renderer/renderer_blink_platform_impl.cc
+++ b/content/renderer/renderer_blink_platform_impl.cc
@@ -936,6 +936,14 @@ blink::WebGraphicsContext3D*
 RendererBlinkPlatformImpl::createOffscreenGraphicsContext3D(
     const blink::WebGraphicsContext3D::Attributes& attributes,
     blink::WebGraphicsContext3D* share_context) {
+  return createOffscreenGraphicsContext3D(attributes, share_context, NULL);
+}
+
+blink::WebGraphicsContext3D*
+RendererBlinkPlatformImpl::createOffscreenGraphicsContext3D(
+    const blink::WebGraphicsContext3D::Attributes& attributes,
+    blink::WebGraphicsContext3D* share_context,
+    blink::WebGLInfo* gl_info) {
   if (!RenderThreadImpl::current())
     return NULL;
 
@@ -956,6 +964,15 @@ RendererBlinkPlatformImpl::createOffscreenGraphicsContext3D(
       RenderThreadImpl::current()->EstablishGpuChannelSync(
           CAUSE_FOR_GPU_LAUNCH_WEBGRAPHICSCONTEXT3DCOMMANDBUFFERIMPL_INITIALIZE));
 
+  if (gpu_channel_host.get() && gl_info) {
+    const gpu::GPUInfo& gpu_info = gpu_channel_host->gpu_info();
+    gl_info->vendorInfo.assign(blink::WebString::fromUTF8(gpu_info.gl_vendor));
+    gl_info->rendererInfo.assign(
+        blink::WebString::fromUTF8(gpu_info.gl_renderer));
+    gl_info->driverVersion.assign(
+        blink::WebString::fromUTF8(gpu_info.gl_version));
+  }
+
   WebGraphicsContext3DCommandBufferImpl::SharedMemoryLimits limits;
   bool lose_context_when_out_of_memory = false;
   scoped_ptr<WebGraphicsContext3DCommandBufferImpl> context(