Adding drawable to CRD andorid and iOS gl rendering pipeline.

remoting/client/display/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.
 
 source_set("display") {
   sources = [
+    "canvas.h",
+    "drawable.h",
     "gl_canvas.cc",
     "gl_canvas.h",
     "gl_cursor.cc",
     "gl_cursor.h",
     "gl_cursor_feedback.cc",
     "gl_cursor_feedback.h",
     "gl_cursor_feedback_texture.cc",
     "gl_cursor_feedback_texture.h",
     "gl_desktop.cc",
     "gl_desktop.h",
@@ skipping 32 matching lines @@
 
   if (is_win) {
     deps += [ "//third_party/angle:libGLESv2" ]
   }
 }
 
 source_set("unit_tests") {
   testonly = true
 
   sources = [
+    "fake_canvas.cc",
+    "fake_canvas.h",
     "gl_renderer_unittest.cc",
   ]
 
   configs += [
     "//remoting/build/config:version",
     "//remoting/build/config:enable_webrtc_remoting_client",
   ]
 
   deps = [
     ":display",
     "//remoting/proto",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/webrtc/base:rtc_base",
   ]
 
   if (is_win) {
     # Windows clang builder fails to link the test binary with ANGLE GLESv2.
     # crbug.com/642027
     sources -= [ "gl_renderer_unittest.cc" ]
     deps -= [ ":display" ]
   }
 }