Add missing cacheinvalidation_proto_cpp target to invalidation_impl and export it to dependents of …

components/invalidation/impl/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.
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
 static_library("impl") {
   sources = [
     "invalidation_logger.cc",
@@ skipping 114 matching lines @@
 
   deps = [
     "//base",
     "//components/gcm_driver:test_support",
     "//components/keyed_service/core",
     "//google_apis",
     "//jingle:notifier",
     "//jingle:notifier_test_util",
     "//net",
     "//testing/gmock",
-    "//third_party/cacheinvalidation",
 
     # TODO(sync): Remove this (http://crbug.com/133352);
     "//third_party/protobuf:protobuf_lite",
 
     # "//third_party/cacheinvalidation/src/google/cacheinvalidation:cacheinvalidation_proto_cpp",
   ]
+  public_deps = [
+    "//third_party/cacheinvalidation",
+  ]
 
   if (is_android) {
     deps += [ ":jni_headers" ]
   } else {
     sources += [
       "p2p_invalidation_service.cc",
       "p2p_invalidation_service.h",
     ]
   }
 }
@@ skipping 36 matching lines @@
       "//base:base_java_test_support",
     ]
   }
   generate_jni("jni_headers") {
     sources = [
       "android/java/src/org/chromium/components/invalidation/InvalidationService.java",
     ]
     jni_package = "components/invalidation"
   }
 }