Detect Chrome either by renderer or version strings.

We currently detect Chrome by GL_RENDERER. In anticipation of changes in Chrome to no longer override the renderer string we now also check the version string.

Change-Id: Ice4ac3ae8ced5ac3d8fd2099300f0a3285f9c197
Reviewed-on: https://skia-review.googlesource.com/9807
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>

src/gpu/gl/GrGLUtil.cpp

@@ -111,7 +111,8 @@ void GrGLGetDriverInfo(GrGLStandard standard,
         versionString = "";
     }
 
-    if (0 == strcmp(rendererString, "Chromium")) {
+    if (0 == strcmp(rendererString, "Chromium") ||
+        2 == sscanf(versionString, "OpenGL ES %d.%d Chromium", &major, &minor)) {
         *outDriver = kChromium_GrGLDriver;
         return;
     }