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

 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

@@ -19,9 +19,11 @@
   '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 \
+       ['(target_arch == "armv7" or target_arch == "armv7s" or \
        (target_arch == "arm" and arm_version >= 7) or target_arch == "arm64")\
        and target_subarch != 64 and (arm_neon == 1 or arm_neon_optional == 1)',
        {
@@ -30,7 +32,7 @@
     ],
   },
   'conditions': [
-    [ 'build_neon != 0', {
+    ['build_neon != 0', {
       'targets': [
         # The NEON-specific components.
         {
@@ -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',
+              ],
+            }],
+          ],
         },
       ],
     }],
@@ -82,12 +93,12 @@
       # Allows libyuv.a redistributable library without external dependencies.
       'standalone_static_library': 1,
       'conditions': [
-        [ 'OS == "ios" and target_subarch == 64', {
+        ['OS == "ios" and target_subarch == 64', {
           'defines': [
             'LIBYUV_DISABLE_NEON'
           ],
         }],
-        [ 'OS != "ios" and libyuv_disable_jpeg != 1', {
+        ['OS != "ios" and libyuv_disable_jpeg != 1', {
           'defines': [
             'HAVE_JPEG'
           ],
@@ -111,12 +122,12 @@
             }],
           ],
         }],
-        [ 'build_neon != 0', {
+        ['build_neon != 0', {
           'dependencies': [
             'libyuv_neon',
           ],
           'conditions': [
-          #TODO LIBYUV_NEON is temporary disabled. When all arm64 port has
+          # TODO LIBYUV_NEON is temporary disabled. When all arm64 port has
           # been done, enable it.
           ['target_arch !="arm64"', {
           'defines': [