skia: add ability to load command_buffer_gles2

dm/DMGpuSupport.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef DMGpuSupport_DEFINED
 #define DMGpuSupport_DEFINED
 
@@ skipping 46 matching lines @@
 
 struct GrContextOptions {};
 
 class GrContextFactory {
 public:
     GrContextFactory() {};
     explicit GrContextFactory(const GrContextOptions&) {}
 
     typedef int GLContextType;
 
-    static const GLContextType kANGLE_GLContextType  = 0,
-                               kDebug_GLContextType  = 0,
-                               kMESA_GLContextType   = 0,
-                               kNVPR_GLContextType   = 0,
-                               kNative_GLContextType = 0,
-                               kNull_GLContextType   = 0;
+    static const GLContextType kANGLE_GLContextType         = 0,
+                               kCommandBuffer_GLContextType = 0,
+                               kDebug_GLContextType         = 0,
+                               kMESA_GLContextType          = 0,
+                               kNVPR_GLContextType          = 0,
+                               kNative_GLContextType        = 0,
+                               kNull_GLContextType          = 0;
     static const int kGLContextTypeCnt = 1;
     void destroyContexts() {}
 
     void abandonContexts() {}
 };
 
 namespace DM {
 
 static const bool kGPUDisabled = true;
 
 static inline SkSurface* NewGpuSurface(GrContextFactory*,
                                        GrContextFactory::GLContextType,
                                        GrGLStandard,
                                        SkImageInfo,
                                        int,
                                        bool) {
     return nullptr;
 }
 
 }  // namespace DM
 
 #endif//SK_SUPPORT_GPU
 
 #endif//DMGpuSupport_DEFINED