[Device Service] Move Gamepad Blink headers to be part of the Gamepad client library

ppapi/shared_impl/ppb_gamepad_shared.cc

Index: ppapi/shared_impl/ppb_gamepad_shared.cc
diff --git a/ppapi/shared_impl/ppb_gamepad_shared.cc b/ppapi/shared_impl/ppb_gamepad_shared.cc
index 4ee0dd94761e3d20df3a029d4fda65fed7da78b5..ee588018bff8d89ae97e439c038a33ff0028e473 100644
--- a/ppapi/shared_impl/ppb_gamepad_shared.cc
+++ b/ppapi/shared_impl/ppb_gamepad_shared.cc
@@ -8,6 +8,8 @@
 
 #include <algorithm>
 
+#include "device/gamepad/public/cpp/gamepads.h"
+
 namespace ppapi {
 
 const size_t WebKitGamepads::kItemsLengthCap;
@@ -34,4 +36,26 @@ void ConvertWebKitGamepadData(const WebKitGamepads& webkit_data,
   }
 }
 
+void ConvertDeviceGamepadData(const device::Gamepads& device_data,
+                              PP_GamepadsSampleData* output_data) {
+  output_data->length = device::Gamepads::kItemsLengthCap;
+  for (unsigned i = 0; i < device::Gamepads::kItemsLengthCap; ++i) {
+    PP_GamepadSampleData& output_pad = output_data->items[i];
+    const device::Gamepad& device_pad = device_data.items[i];
+    output_pad.connected = device_pad.connected ? PP_TRUE : PP_FALSE;
+    if (device_pad.connected) {
+      static_assert(sizeof(output_pad.id) == sizeof(device_pad.id),
+                    "id size does not match");
+      memcpy(output_pad.id, device_pad.id, sizeof(output_pad.id));
+      output_pad.timestamp = static_cast<double>(device_pad.timestamp);
+      output_pad.axes_length = device_pad.axes_length;
+      for (unsigned j = 0; j < device_pad.axes_length; ++j)
+        output_pad.axes[j] = static_cast<float>(device_pad.axes[j]);
+      output_pad.buttons_length = device_pad.buttons_length;
+      for (unsigned j = 0; j < device_pad.buttons_length; ++j)
+        output_pad.buttons[j] = static_cast<float>(device_pad.buttons[j].value);
+    }
+  }
+}
+
 }  // namespace ppapi