Fail to create GrContext when we get a NULL for a GL/GLSL version string

src/gpu/gl/GrGLContext.cpp

Index: src/gpu/gl/GrGLContext.cpp
diff --git a/src/gpu/gl/GrGLContext.cpp b/src/gpu/gl/GrGLContext.cpp
index 54deb323c0a60ff6a40dc7407a5bda900f2e5220..5bc5b6f0312bd65b1e7fd6cf251f167595492c1e 100644
--- a/src/gpu/gl/GrGLContext.cpp
+++ b/src/gpu/gl/GrGLContext.cpp
@@ -37,8 +37,13 @@ bool GrGLContextInfo::initialize(const GrGLInterface* interface) {
         if (interface->validate()) {
 
             fGLVersion = GrGLGetVersionFromString(ver);
+            if (GR_GL_INVALID_VER == fGLVersion) {
+                return false;
+            }
 
-            fGLSLGeneration = GrGetGLSLGeneration(interface);
+            if (!GrGetGLSLGeneration(interface, &fGLSLGeneration)) {
+                return false;
+            }
 
             fVendor = GrGLGetVendor(interface);
 
@@ -51,9 +56,7 @@ bool GrGLContextInfo::initialize(const GrGLInterface* interface) {
             // This must occur before caps init.
             fInterface.reset(SkRef(interface));
 
-            fGLCaps->init(*this, interface);
-
-            return true;
+            return fGLCaps->init(*this, interface);
         }
     }
     return false;