Treat bad values passed to --images as a fatal error

gyp/common_variables.gypi

Index: gyp/common_variables.gypi
diff --git a/gyp/common_variables.gypi b/gyp/common_variables.gypi
index abbe729da1365834c229aea65739d46ad545a6ae..17c5364afc3cec362a6e7a2441a7511dcb94d34a 100644
--- a/gyp/common_variables.gypi
+++ b/gyp/common_variables.gypi
@@ -38,10 +38,6 @@
   'variables': {  # level 1
     'angle_path%': '../',
 
-    # RAW codec needs exceptions. Due to that, it is a separate target. Its usage can be controlled
-    # by this variable.
-    'skia_codec_decodes_raw%': 1,
-
     'variables': {  # level 2
 
       # Variables needed by conditions list within the level-2 variables dict.
@@ -62,6 +58,14 @@
           }, {
             'skia_arch_type%': 'x86',
           }],
+          # RAW codec needs exceptions. Due to that, it is a separate target. Its usage can be
+          # controlled by skia_codec_decodes_raw.
+          ['skia_os == "chromeos"', {

[scroggo, 2016/01/27 19:42:27]

Once chromeos supports RAW, this can go back to the older file, which is
simpler, but this will allow us to start testing in case the chromeos fix takes
some more time.

+            # FIXME: fix the support for ChromeOS [DNG SDK issue with clock_gettime()].
+            'skia_codec_decodes_raw%' : 0,
+          }, {
+            'skia_codec_decodes_raw%' : 1,
+          }],
         ],
         'arm_version%': 0,
         'arm_neon%': 0,
@@ -72,6 +76,7 @@
       # so that siblings of the level-2 'variables' dict can see them.
       # (skia_os will depend on skia_android_framework.)
       'skia_android_framework%': '<(skia_android_framework)',
+      'skia_codec_decodes_raw%': '<(skia_codec_decodes_raw)',
       'skia_arch_type%': '<(skia_arch_type)',
       'arm_version%': '<(arm_version)',
       'arm_neon%': '<(arm_neon)',
@@ -214,6 +219,7 @@
     'skia_gpu_extra_tests_path%': '<(skia_gpu_extra_tests_path)',
     'skia_stroke_path_rendering%': '<(skia_stroke_path_rendering)',
     'skia_android_framework%': '<(skia_android_framework)',
+    'skia_codec_decodes_raw%': '<(skia_codec_decodes_raw)',
     'skia_use_android_framework_defines%': '<(skia_use_android_framework_defines)',
     'skia_use_system_json%': '<(skia_use_system_json)',
     'skia_android_path_rendering%': '<(skia_android_path_rendering)',