Implement the gamepad API in the IPC proxy

content/common/gamepad_user_gesture.cc

Index: content/common/gamepad_user_gesture.cc
diff --git a/content/common/gamepad_user_gesture.cc b/content/common/gamepad_user_gesture.cc
new file mode 100644
index 0000000000000000000000000000000000000000..1e08b52912d9672c687e9e4029012ad3f6ed89f9
--- /dev/null
+++ b/content/common/gamepad_user_gesture.cc
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+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/common/gamepad_user_gesture.h"
+
+#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebGamepads.h"
+
+namespace content {
+
+bool GamepadsHaveUserGesture(const WebKit::WebGamepads& gamepads) {
+  bool has_user_gesture = false;
+  for (unsigned i = 0; i < WebKit::WebGamepads::itemsLengthCap; i++) {
+    const WebKit::WebGamepad& pad = gamepads.items[i];
+
+    // If the device is physically connected, then check the primary 4 buttons
+    // to see if there is currently an intentional user action.
+    if (pad.connected) {
+      const int kPrimaryInteractionButtons = 4;
+      for (int button_index = 0; button_index < kPrimaryInteractionButtons;
+           button_index++) {
+        if (pad.buttons[button_index] > 0.5f)
+          return true;
+      }
+    }
+  }
+  return false;
+}
+
+}  // namespace content