Compile specific parts of the Android build with -O2.

build/android/increase_size_for_speed.gypi

+# Copyright (c) 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.
+
+# This file is meant to be included to optimize a target for speed
+# rather than for size on Android.
+# This is used in some carefully tailored targets and is not meant
+# to be included everywhere. Before adding the template to another target,
+# please ask in chromium-dev@. See crbug.com/411909
+
+{
+  'configurations': {
+    'Release': {
+      'target_conditions': [
+        ['_toolset=="target"', {
+          'conditions': [
+            ['OS=="android" and fastbuild==0', {
+              'cflags!': ['-Os'],
+              'cflags': ['-O2'],
+            }],
+          ],
+        }],
+      ],
+    },
+  },
+}