Implement native GMB backbuffers in the GLES2 Command Decoder.

gpu/gpu.gyp

Index: gpu/gpu.gyp
diff --git a/gpu/gpu.gyp b/gpu/gpu.gyp
index b1791e8c436f7171bbea05e5a7b3358518837a54..f7b73b422f2e49f918290038ca09583e4684ffa4 100644
--- a/gpu/gpu.gyp
+++ b/gpu/gpu.gyp
@@ -451,6 +451,7 @@
         'command_buffer/tests/gl_lose_context_chromium_unittest.cc',
         'command_buffer/tests/gl_manager.cc',
         'command_buffer/tests/gl_manager.h',
+        'command_buffer/tests/gl_native_gmb_backbuffer_unittest.cc',
         'command_buffer/tests/gl_pointcoord_unittest.cc',
         'command_buffer/tests/gl_program_unittest.cc',
         'command_buffer/tests/gl_query_unittest.cc',
@@ -467,6 +468,8 @@
         'command_buffer/tests/gl_unittests_android.cc',
         'command_buffer/tests/gl_virtual_contexts_unittest.cc',
         'command_buffer/tests/occlusion_query_unittest.cc',
+        'command_buffer/tests/texture_image_factory.cc',
+        'command_buffer/tests/texture_image_factory.h',
       ],
       'conditions': [
         ['OS == "android"', {