Implement support for using GL ES 3.0 with command buffer

include/gpu/gl/command_buffer/SkCommandBufferGLContext.h

 
 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef SKCOMMANDBUFFERGLCONTEXT_DEFINED
 #define SKCOMMANDBUFFERGLCONTEXT_DEFINED
 
 #if SK_COMMAND_BUFFER
 
 #include "gl/SkGLContext.h"
 
 class SkCommandBufferGLContext : public SkGLContext {
 public:
     ~SkCommandBufferGLContext() override;
 
-    static SkCommandBufferGLContext* Create() {
-        SkCommandBufferGLContext* ctx = new SkCommandBufferGLContext;
+    static SkCommandBufferGLContext* CreateES2() {
+        SkCommandBufferGLContext* ctx = new SkCommandBufferGLContext(kGLES2_ContextVersion);
         if (!ctx->isValid()) {
             delete ctx;
             return nullptr;
+        }
+        return ctx;
+    }
+    static SkCommandBufferGLContext* CreateES3() {
+        SkCommandBufferGLContext* ctx = new SkCommandBufferGLContext(kGLES3_ContextVersion);
+        if (!ctx->isValid()) {
+            delete ctx;
+            return nullptr;
         }
         return ctx;
     }
 
     static SkCommandBufferGLContext* Create(void* nativeWindow, int msaaSampleCount) {
         SkCommandBufferGLContext* ctx = new SkCommandBufferGLContext(nativeWindow,
                                                                      msaaSampleCount);
         if (!ctx->isValid()) {
             delete ctx;
             return nullptr;
         }
         return ctx;
     }
 
     void presentCommandBuffer();
 
     bool makeCurrent();
     int getStencilBits();
     int getSampleCount();
 
 private:
-    SkCommandBufferGLContext();
+    enum ContextVersion {
+        kGLES2_ContextVersion,
+        kGLES3_ContextVersion
+    };
+    SkCommandBufferGLContext(ContextVersion minContextVersion);
     SkCommandBufferGLContext(void* nativeWindow, int msaaSampleCount);
-    void initializeGLContext(void* nativeWindow, const int* configAttribs,
-                             const int* surfaceAttribs);
+    void initializeGLContext(ContextVersion minContextVersion, void* nativeWindow,
+                             const int* configAttribs, const int* surfaceAttribs);
     void destroyGLContext();
 
     void onPlatformMakeCurrent() const override;
     void onPlatformSwapBuffers() const override;
     GrGLFuncPtr onPlatformGetProcAddress(const char* name) const override;
 
     void* fContext;
     void* fDisplay;
     void* fSurface;
     void* fConfig;
 };
 
 #endif // SK_COMMAND_BUFFER
 
 #endif