Add BlimpDocument, pull out functions in BlimpCompositor.

blimp/client/core/feedback/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("feedback") {
   visibility = [ "//blimp/client/core/*" ]
 
   sources = [
     "blimp_feedback_data.cc",
     "blimp_feedback_data.h",
   ]
 
   deps = [
     "//base",
     "//blimp/client/core/contents",
+    "//skia",

[Khushal, 2016/10/03 20:04:59]

Is skia needed here?

[xingliu, 2016/10/04 18:33:49]

Removed, I think I got gn check failed before rebase, weird.

   ]
 
   if (is_android) {
     sources += [
       "android/blimp_feedback_data_android.cc",
       "android/blimp_feedback_data_android.h",
     ]
 
     deps += [ ":feedback_jni_headers" ]
   }
@@ skipping 34 matching lines @@
   generate_jni("feedback_jni_headers") {
     visibility = [ ":*" ]
 
     sources = [
       "android/java/src/org/chromium/blimp/core/feedback/BlimpFeedbackData.java",
     ]
 
     jni_package = "blimp/client/core"
   }
 }