Support using OpenGL ES context on desktop

src/gpu/gl/SkGLContextHelper.cpp

Index: src/gpu/gl/SkGLContextHelper.cpp
diff --git a/src/gpu/gl/SkGLContextHelper.cpp b/src/gpu/gl/SkGLContextHelper.cpp
index b06f755f677196bfabd5fcd58dda6a213cda665d..2381a84519b868618c21523baee44a57fe083e2f 100644
--- a/src/gpu/gl/SkGLContextHelper.cpp
+++ b/src/gpu/gl/SkGLContextHelper.cpp
@@ -27,13 +27,14 @@ SkGLContextHelper::~SkGLContextHelper() {
     SkSafeUnref(fGL);
 }
 
-bool SkGLContextHelper::init(int width, int height) {
+bool SkGLContextHelper::init(GrGLStandard forcedGpuAPI, int width,
+                             int height) {
     if (fGL) {
         fGL->unref();
         this->destroyGLContext();
     }
 
-    fGL = this->createGLContext();
+    fGL = this->createGLContext(forcedGpuAPI);
     if (fGL) {
         const GrGLubyte* temp;