GYP changes and scripts for compiling Skia for ChromeOS

gyp/common_conditions.gypi

 # conditions used in both common.gypi and skia.gyp in chromium
 #
 {
   'defines': [
     'SK_ALLOW_STATIC_GLOBAL_INITIALIZERS=<(skia_static_initializers)',
 #    'SK_SUPPORT_HINTING_SCALE_FACTOR',
   ],
   'conditions' : [
     [ 'skia_gpu == 1',
       {
@@ skipping 99 matching lines @@
                 'AdditionalOptions': [
                   '/we4189', # initialized but unused var warning
                 ],
               },
             },
           }],
         ],
       },
     ],
 
-    [ 'skia_os in ["linux", "freebsd", "openbsd", "solaris", "nacl"]',
+    [ 'skia_os in ["linux", "freebsd", "openbsd", "solaris", "nacl", "chromeos"]',
       {
         'defines': [
           'SK_SAMPLES_FOR_X',
           'SK_BUILD_FOR_UNIX',
         ],
         'configurations': {
           'Debug': {
             'cflags': ['-g']
           },
           'Release': {
             'cflags': ['-O3 -g'],
             'defines': [ 'NDEBUG' ],
           },
         },
         'cflags': [
           '-Wall',
           '-Wextra',
           # suppressions below here were added for clang
           '-Wno-unused-parameter',
           '-Wno-c++11-extensions'
         ],
         'conditions' : [
           [ 'skia_warnings_as_errors', {
             'cflags': [
               '-Werror',
             ],
           }],
-          [ 'skia_arch_width == 64', {
-            'cflags': [
-              '-m64',
-            ],
-            'ldflags': [
-              '-m64',
-            ],
-          }],
-          [ 'skia_arch_width == 32', {
-            'cflags': [
-              '-m32',
-            ],
-            'ldflags': [
-              '-m32',
-            ],
-          }],
           [ 'skia_os == "nacl"', {
             'defines': [
               'SK_BUILD_FOR_NACL',
             ],
             'link_settings': {
               'libraries': [
                 '-lppapi',
                 '-lppapi_cpp',
                 '-lnosys',
                 '-pthread',
               ],
             },
           }, { # skia_os != "nacl"
             'include_dirs' : [
               '/usr/include/freetype2',
             ],
           }],
+          [ 'skia_os == "chromeos"', {
+            'ldflags': [
+              '--sysroot=/build/<(skia_cros_target)',
+              '-lstdc++',
+              '-lm',
+            ],
+          }, {
+            'conditions': [
+              [ 'skia_arch_width == 64', {
+                'cflags': [
+                  '-m64',
+                ],
+                'ldflags': [
+                  '-m64',
+                ],
+              }],
+              [ 'skia_arch_width == 32', {
+                'cflags': [
+                  '-m32',
+                ],
+                'ldflags': [
+                  '-m32',
+                ],
+              }],
+            ],
+          }],
         ],
       },
     ],
 
     [ 'skia_os == "mac"',
       {
         'variables': {
           'mac_sdk%': '<!(python <(DEPTH)/tools/find_mac_sdk.py 10.6)',
         },
         'defines': [
@@ skipping 213 matching lines @@
   'xcode_settings': {
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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