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

src/gpu/gl/GrGLCaps.cpp

Index: src/gpu/gl/GrGLCaps.cpp
diff --git a/src/gpu/gl/GrGLCaps.cpp b/src/gpu/gl/GrGLCaps.cpp
index 6fe804f2f89cba82830df271f0c54172c3d29119..501411c0e98fed6bd997d7da6521853da6254dd4 100644
--- a/src/gpu/gl/GrGLCaps.cpp
+++ b/src/gpu/gl/GrGLCaps.cpp
@@ -90,11 +90,11 @@ GrGLCaps& GrGLCaps::operator= (const GrGLCaps& caps) {
     return *this;
 }
 
-void GrGLCaps::init(const GrGLContextInfo& ctxInfo, const GrGLInterface* gli) {
+bool GrGLCaps::init(const GrGLContextInfo& ctxInfo, const GrGLInterface* gli) {
 
     this->reset();
     if (!ctxInfo.isInitialized()) {
-        return;
+        return false;
     }
 
     GrGLStandard standard = ctxInfo.standard();
@@ -353,6 +353,8 @@ void GrGLCaps::init(const GrGLContextInfo& ctxInfo, const GrGLInterface* gli) {
     }
 
     this->initConfigRenderableTable(ctxInfo);
+
+    return true;
 }
 
 void GrGLCaps::initConfigRenderableTable(const GrGLContextInfo& ctxInfo) {