Updating Gamepad API to match latest spec

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 4c85eaf4b0d12561edc07fb876b7eb03349a4726..cb9a552eb35dcab4f109fc154e55e82b49a1a014 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -1274,6 +1274,10 @@
     # Force disable libstdc++ debug mode.
     'disable_glibcxx_debug%': 0,
 
+    # Enable a new Gamepad interface. This is temporary and should go
+    # away once the chrome and blink interfaces are in sync
+    'enable_new_gamepad_api%': 1,
+
     'conditions': [
       # The version of GCC in use, set later in platforms that use GCC and have
       # not explicitly chosen to build with clang. Currently, this means all
@@ -2252,6 +2256,9 @@
       ['enable_hidpi==1', {
         'defines': ['ENABLE_HIDPI=1'],
       }],
+      ['enable_new_gamepad_api==1', {
+        'defines': ['ENABLE_NEW_GAMEPAD_API=1'],
+      }],
       ['native_discardable_memory==1', {
         'defines': ['DISCARDABLE_MEMORY_ALWAYS_SUPPORTED_NATIVELY'],
       }],