Turn on ENABLE_NEW_GAMEPAD_API flag so that the new gamepad code is used

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index bb72124c887627b1c76ec4eb1479dff530d6cb0a..82649a83fa791adbb993c4cd97f8a8647d731868 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -2276,6 +2276,11 @@
       # Targets are by default not nacl untrusted code.
       'nacl_untrusted_build%': 0,
 
+      # Enable a new Gamepad interface.
+      # TODO(cdumez): This is temporary and should go away once the chromium
+      # and blink interfaces are in sync, http://crbug.com/344556.
+      'enable_new_gamepad_api%': 1,
+
       'pnacl_compile_flags': [
         # pnacl uses the clang compiler so we need to suppress all the
         # same warnings as we do for clang.
@@ -2445,6 +2450,9 @@
       ['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'],
       }],