Add workaround for Xoom crashing after discard removed from shader.

src/gpu/gl/GrGLUtil.cpp

Index: src/gpu/gl/GrGLUtil.cpp
diff --git a/src/gpu/gl/GrGLUtil.cpp b/src/gpu/gl/GrGLUtil.cpp
index 7d44ba59316b3e843c0ce1eae1cbe7b40656848b..87e2f83a289cf34f6c74cc79ef91a9ade3b6b1c5 100644
--- a/src/gpu/gl/GrGLUtil.cpp
+++ b/src/gpu/gl/GrGLUtil.cpp
@@ -227,6 +227,8 @@ GrGLRenderer GrGLGetRendererFromString(const char* rendererString) {
     if (NULL != rendererString) {
         if (0 == strcmp(rendererString, "NVIDIA Tegra 3")) {
             return kTegra3_GrGLRenderer;
+        } else if (0 == strcmp(rendererString, "NVIDIA Tegra")) {
+            return kTegra2_GrGLRenderer;
         }
     }
     return kOther_GrGLRenderer;