[remoting android] Plumb It2Me events from C++ to Java

remoting/android/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/android/config.gni")
 import("//build/config/android/rules.gni")
 import("//remoting/android/client_java_tmpl.gni")
 import("//remoting/android/remoting_apk_tmpl.gni")
 import("//remoting/remoting_options.gni")
 import("//remoting/tools/build/remoting_localize.gni")
@@ skipping 166 matching lines @@
   resource_dirs = [ "host/res" ]
   deps = [
     "//third_party/android_tools:android_support_v7_appcompat_resources",
   ]
 }
 
 android_apk("remoting_host_apk") {
   apk_name = "ChromotingHost"
   android_manifest = "host/AndroidManifest.xml"
   native_libs = [ "libremoting_host_jni.so" ]
-  java_files = [
-    "host/src/org/chromium/chromoting/host/MainActivity.java",
-    "host/src/org/chromium/chromoting/host/OAuthTokenFetcher.java",
-    "host/src/org/chromium/chromoting/host/jni/Host.java",
+  _java_file_prefix = "host/src/org/chromium/chromoting/host"
+  _java_files = [
+    "MainActivity.java",
+    "OAuthTokenFetcher.java",
+    "jni/Host.java",
+    "jni/It2MeObserver.java",
   ]
+  java_files = rebase_path(_java_files, ".", _java_file_prefix)
   deps = [
     ":remoting_host_apk_resources",
     ":remoting_host_jni",
     "//base:base_java",
     "//net/android:net_java",
     "//third_party/android_tools:android_support_v13_java",
     "//third_party/android_tools:android_support_v7_appcompat_java",
     google_play_services_library,
   ]
 }