Adds an iOS implementation of gfx::Image.

skia/skia.gyp

Index: skia/skia.gyp
diff --git a/skia/skia.gyp b/skia/skia.gyp
index 618ac91f9952287c69fcf7794369149bd95f4462..894e360afce84fea34fa9c2e8c0019ce793d2137 100644
--- a/skia/skia.gyp
+++ b/skia/skia.gyp
@@ -183,6 +183,8 @@
         'ext/skia_sandbox_support_win.h',
         'ext/skia_sandbox_support_win.cc',
         'ext/skia_trace_shim.h',
+        'ext/skia_utils_ios.mm',
+        'ext/skia_utils_ios.h',
         'ext/skia_utils_mac.mm',
         'ext/skia_utils_mac.h',
         'ext/skia_utils_win.cc',
@@ -308,6 +310,11 @@
             'SK_DEFAULT_FONT_CACHE_LIMIT=(20*1024*1024)',
           ],
         }],
+        [ 'OS != "ios"', {
+          'sources/': [
+            ['exclude', '_ios\\.(cc|cpp|mm?)$'],
+          ],
+        }],
         [ 'OS != "mac"', {
           'sources/': [
             ['exclude', '_mac\\.(cc|cpp|mm?)$'],
@@ -593,6 +600,7 @@
           'sources/': [
             ['include', 'SkFontHost_mac\\.cpp$',],
             ['include', 'SkStream_mac\\.cpp$',],
+            ['include', 'SkCreateCGImageRef\\.cpp$',],
           ],
         }],
       ],