Add LTO support for Android Chromium.

BUG=354
This is to add support for a Link-Time Optimizations experiment in Android
Chromium. As it is disabled by default, it won't change anything for most
configurations.

R=tpsiaki@google.com

Review URL: https://webrtc-codereview.appspot.com/21329004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1061 16f28f9a-4ce2-e073-06de-1de4eb20be90

README.chromium

@@ -1,6 +1,6 @@
 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 1059
+Version: 1061
 License: BSD
 License File: LICENSE
 

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_  // NOLINT
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 1059
+#define LIBYUV_VERSION 1061
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT

libyuv.gyp

@@ -19,6 +19,8 @@
   'variables': {
     'use_system_libjpeg%': 0,
     'libyuv_disable_jpeg%': 0,
+    # Link-Time Optimizations.
+    'use_lto%': 0,
     'build_neon': 0,
     'conditions': [
        ['(target_arch == "armv7" or target_arch == "armv7s" or \
@@ -70,6 +72,15 @@
             'source/scale_neon.cc',
             'source/scale_neon64.cc',
           ],
+          'conditions': [
+            # Disable LTO in libyuv_neon target due to compiler bug
+            ['use_lto == 1', {
+              'cflags!': [
+                '-flto',
+                '-ffat-lto-objects',
+              ],
+            }],
+          ],
         },
       ],
     }],