IME for Mus: Add ui.mojom.CompositionText and its struct traits.

ui/base/ime/BUILD.gn

 # Copyright 2015 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/ui.gni")
 import("//testing/test.gni")
 
 source_set("text_input_types") {
   sources = [
     "text_input_flags.h",
@@ skipping 103 matching lines @@
     "//ui/display",
     "//ui/events",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/gfx/range",
     "//url",
   ]
 
   public_deps = [
     ":text_input_types",
+    "//skia",

[sadrul, 2016/11/29 20:51:35]

Why is this needed?

[Hadi, 2016/11/29 21:33:37]

composition_underline.h uses SkColor in a public field. If we skip this, we get
"fatal error: 'SkTypes.h' file not found" when building ime_struct_traits.
Directly depending on "//third_party/skia" causes errors like "is_fuchsia not
defined".

Searching for "//third_party/skia" in BUILD.gn files doesn't return much
results:
https://cs.chromium.org/search/?q=//third_party/skia+file:BUILD.gn&sq=package...,
so I went with "//skia".

   ]
 
   if (!use_aura || (!is_linux && !use_ozone)) {
     sources -= [
       "input_method_auralinux.cc",
       "input_method_auralinux.h",
     ]
   }
 
   if (use_aura && is_android) {
@@ skipping 64 matching lines @@
     libs = [ "AppKit.framework" ]
   }
 
   if (use_ozone) {
     deps += [
       "//ui/events/ozone:events_ozone_layout",
       "//ui/ozone",
     ]
   }
 }