Add a full Blimp integration test.

blimp/client/support/compositor/BUILD.gn

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 }
 
 source_set("compositor") {
   sources = [
     "blimp_context_provider.cc",
     "blimp_context_provider.h",
+    "blimp_embedder_compositor.cc",
+    "blimp_embedder_compositor.h",
     "blimp_gpu_memory_buffer_manager.cc",
     "blimp_gpu_memory_buffer_manager.h",
     "blimp_layer_tree_settings.cc",
     "blimp_layer_tree_settings.h",
     "compositor_dependencies_impl.cc",
     "compositor_dependencies_impl.h",
   ]
 
   public_deps = [
     "//base",
     "//cc",
     "//gpu/command_buffer/client",
     "//gpu/command_buffer/client:gl_in_process_context",
     "//gpu/command_buffer/client:gles2_c_lib",
     "//gpu/command_buffer/client:gles2_implementation",
     "//ui/gl",
   ]
 
   deps = [
     "//blimp/client/public:public_headers",
     "//cc/surfaces",
     "//gpu/skia_bindings",
     "//skia",
     "//ui/gfx:memory_buffer",
   ]
 }
-
-source_set("test_support") {
-  testonly = true
-
-  sources = [
-    "mock_compositor_dependencies.cc",
-    "mock_compositor_dependencies.h",
-  ]
-
-  deps = [
-    "//cc:test_support",
-  ]
-
-  public_deps = [
-    ":compositor",
-  ]
-}