Add a mojo channel for frame messages.

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("features.gni")
 import("//build/buildflag_header.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//media/media_options.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
@@ skipping 583 matching lines @@
   sources = [
     "associated_interfaces.mojom",
     "child.mojom",
     "child_memory_coordinator.mojom",
     "field_trial_recorder.mojom",
     "frame.mojom",
     "frame_sink_provider.mojom",
     "host_zoom.mojom",
     "image_downloader/image_downloader.mojom",
     "indexed_db/indexed_db.mojom",
+    "input/input_handler.mojom",
     "leveldb_wrapper.mojom",
     "manifest_observer.mojom",
     "media/media_devices.mojom",
     "media/renderer_audio_output_stream_factory.mojom",
     "memory_coordinator.mojom",
     "native_types.mojom",
     "network_service.mojom",
     "push_messaging.mojom",
     "render_frame_message_filter.mojom",
     "render_message_filter.mojom",
@@ skipping 31 matching lines @@
     "//ui/gfx/mojo",
     "//url/mojo:url_mojom_gurl",
     "//url/mojo:url_mojom_origin",
   ]
 
   component_output_prefix = "content_common_mojo_bindings"
   export_class_attribute = "CONTENT_EXPORT"
   export_define = "CONTENT_IMPLEMENTATION=1"
   export_header = "content/common/content_export.h"
 }