Update Gamepad API to match the latest specification

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 4000efe768d7df16aef16cb3402652c9fd1f45d8..10f11d87cda0c72c362507f3fd1c7a6e752d699d 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -561,6 +561,10 @@
       # Enable hole punching for the protected video.
       'video_hole%': 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': [
         # A flag for POSIX platforms
         ['OS=="win"', {
@@ -1092,6 +1096,7 @@
     'use_goma%': '<(use_goma)',
     'gomadir%': '<(gomadir)',
     'video_hole%': '<(video_hole)',
+    'enable_new_gamepad_api%': '<(enable_new_gamepad_api)',
 
     # Use system protobuf instead of bundled one.
     'use_system_protobuf%': 0,
@@ -2415,6 +2420,9 @@
       ['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'],
       }],