Android WebView: add empty jarjar ruleset.

build/common.gypi

 # Copyright (c) 2012 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 1294 matching lines @@
         'use_system_sqlite%': 0,  # '<(android_webview_build)',
         'use_system_expat%': '<(android_webview_build)',
         'use_system_icu%': '<(android_webview_build)',
         'use_system_stlport%': '<(android_webview_build)',
 
         'enable_managed_users%': 0,
 
         # Copy it out one scope.
         'android_webview_build%': '<(android_webview_build)',
       }],  # OS=="android"
+      ['android_webview_build==1', {
+        # When building the WebView in the Android tree, jarjar will remap all
+        # the class names, so the JNI generator needs to know this.
+        'jni_generator_jarjar_file': '../android_webview/build/jarjar-rules.txt',
+      }],
       ['OS=="mac"', {
         # Enable clang on mac by default!
         'clang%': 1,
       }],  # OS=="mac"
       ['OS=="mac" or OS=="ios"', {
         'variables': {
           # Mac OS X SDK and deployment target support.  The SDK identifies
           # the version of the system headers that will be used, and
           # corresponds to the MAC_OS_X_VERSION_MAX_ALLOWED compile-time
           # macro.  "Maximum allowed" refers to the operating system version
@@ skipping 3194 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }