Implement native GMB backbuffers in the GLES2 Command Decoder.

gpu/BUILD.gn

Index: gpu/BUILD.gn
diff --git a/gpu/BUILD.gn b/gpu/BUILD.gn
index b0537d0e5b591572c6b202c2e3c769136aaa5ef4..1522b7f279c2e277e964617441e8d678002f1e83 100644
--- a/gpu/BUILD.gn
+++ b/gpu/BUILD.gn
@@ -172,6 +172,7 @@ test("gl_tests") {
     "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",
@@ -188,6 +189,8 @@ test("gl_tests") {
     "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",
     "ipc/client/gpu_context_tests.h",
     "ipc/client/gpu_in_process_context_tests.cc",
   ]