Added Dartium changes onto 45.0.2454.104

Source/build/features.gypi

Index: Source/build/features.gypi
diff --git a/Source/build/features.gypi b/Source/build/features.gypi
index 92ab0ca6c77656bcc8a25a89e68d403be7b865f3..4205426748cc5b2f96bd11d64729ea1f7719c0d2 100644
--- a/Source/build/features.gypi
+++ b/Source/build/features.gypi
@@ -49,10 +49,12 @@
     'variables': {
       # Enables the Oilpan garbage-collection infrastructure.
       'enable_oilpan%': 0,
+      'enable_dart%': 1,
       'blink_gc_profiling%': 0,
       'blink_logging_always_on%': 0,
       'link_core_modules_separately%': 1,
     },
+    'enable_dart%': '<(enable_dart)',
     'conditions': [
       ['use_concatenated_impulse_responses==1', {
         # Use concatenated HRTF impulse responses
@@ -106,6 +108,11 @@
           'LOG_DISABLED=0',
         ],
       }],
+      ['enable_dart==1', {
+        'feature_defines': [
+          'ENABLE_DART=1',
+        ],
+      }],
       ['link_core_modules_separately==1 and component=="shared_library"', {
         'feature_defines': [
           'LINK_CORE_MODULES_SEPARATELY',