Reland: VideoCapture: migrate VideoCapture renderer-->host messages to mojo, part 1

content/common/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//media/media_options.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//tools/ipc_fuzzer/ipc_fuzzer.gni")
 if (is_mac) {
@@ skipping 555 matching lines @@
     "render_frame_message_filter.mojom",
     "render_message_filter.mojom",
     "render_widget_window_tree_client_factory.mojom",
     "renderer.mojom",
     "service_worker/embedded_worker.mojom",
     "service_worker/embedded_worker_setup.mojom",
     "service_worker/fetch_event_dispatcher.mojom",
     "storage_partition_service.mojom",
     "url_loader.mojom",
     "url_loader_factory.mojom",
+    "video_capture.mojom",
   ]
 
   import_dirs = [ "//mojo/services" ]
 
   public_deps = [
     "//components/leveldb/public/interfaces",
     "//content/public/common:interfaces",
     "//device/sensors/public/interfaces",
     "//ipc:mojom",
     "//mojo/common:common_custom_types",
     "//services/shell/public/interfaces",
     "//services/ui/public/interfaces",
     "//skia/public/interfaces",
     "//third_party/WebKit/public:mojo_bindings",
     "//third_party/WebKit/public:new_wrapper_types_mojo_bindings",
     "//ui/base/mojo:mojo_bindings",
     "//ui/gfx/geometry/mojo",
     "//ui/gfx/mojo",
     "//url/mojo:url_mojom_gurl",
     "//url/mojo:url_mojom_origin",
   ]
 
   export_class_attribute = "CONTENT_EXPORT"
   export_define = "CONTENT_IMPLEMENTATION=1"
   export_header = "content/common/content_export.h"
 }