Create chrome://device-emulator and add the ability to get a battery percentage and send an updated…

chrome/browser/ui/webui/chromeos/emulator/device_emulator_message_handler.cc

Index: chrome/browser/ui/webui/chromeos/emulator/device_emulator_message_handler.cc
diff --git a/chrome/browser/ui/webui/chromeos/emulator/device_emulator_message_handler.cc b/chrome/browser/ui/webui/chromeos/emulator/device_emulator_message_handler.cc
new file mode 100644
index 0000000000000000000000000000000000000000..05cc4f55aba9270112efbe4396dcec4bfa242c47
--- /dev/null
+++ b/chrome/browser/ui/webui/chromeos/emulator/device_emulator_message_handler.cc
@@ -0,0 +1,60 @@
+// Copyright 2015 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 "chrome/browser/ui/webui/chromeos/emulator/device_emulator_message_handler.h"
+
+#include <stdlib.h>

[oshima, 2015/06/26 16:22:07]

you don't need this, do you?

[rfrappier, 2015/06/26 16:33:08]

It worked without it, but comment #6 indicated that it should be there. Should I
remove it?

[oshima, 2015/06/26 17:19:49]

oh, I missed rand() below. Yes, this should be here.

[rfrappier, 2015/06/26 17:29:13]

Done.

+
+#include "base/bind.h"
+#include "base/values.h"
+#include "chromeos/dbus/power_manager/power_supply_properties.pb.h"

[oshima, 2015/06/26 16:22:07]

and this?

[rfrappier, 2015/06/26 16:33:08]

This will be used later for handling the power supply change. I can remove it
for now if you'd prefer.

[oshima, 2015/06/26 17:19:49]

Please add when necessary. It can confuse reviewers, and you may end up having
different design.

[rfrappier, 2015/06/26 17:29:13]

Done.

[rfrappier, 2015/06/26 17:29:13]

Okay, will remove for now.

+#include "content/public/browser/web_ui.h"
+
+namespace {
+
+// Define the name of the callback functions that will be used by JavaScript

[oshima, 2015/06/26 16:22:07]

. at the end

[rfrappier, 2015/06/26 16:33:08]

Done.

+const char kBatteryPercentFunction[] = "requestBatteryInfo";
+const char kUpdateBatteryPercentFunction[] = "updateBatteryInfo";
+const char kUpdatePowerModeFunction[] = "updatePowerSource";
+const char kBatteryPercentFunctionJSCallback[] =
+    "device_emulator.setBatteryInfo";
+
+}  // namespace
+
+DeviceEmulatorMessageHandler::DeviceEmulatorMessageHandler() {
+}
+
+DeviceEmulatorMessageHandler::~DeviceEmulatorMessageHandler() {
+}
+
+void DeviceEmulatorMessageHandler::RegisterMessages() {
+  web_ui()->RegisterMessageCallback(
+      kBatteryPercentFunction,
+      base::Bind(&DeviceEmulatorMessageHandler::HandleRequestBatteryInfo,
+                 base::Unretained(this)));
+  web_ui()->RegisterMessageCallback(
+      kUpdateBatteryPercentFunction,
+      base::Bind(&DeviceEmulatorMessageHandler::HandleUpdateBatteryInfo,
+                 base::Unretained(this)));
+  web_ui()->RegisterMessageCallback(
+      kUpdatePowerModeFunction,
+      base::Bind(&DeviceEmulatorMessageHandler::HandleUpdatePowerSource,
+                 base::Unretained(this)));
+}
+
+void DeviceEmulatorMessageHandler::HandleRequestBatteryInfo(
+    const base::ListValue* args) {
+  web_ui()->CallJavascriptFunction(kBatteryPercentFunctionJSCallback,
+                                   base::FundamentalValue(rand() % 101));
+}
+
+void DeviceEmulatorMessageHandler::HandleUpdateBatteryInfo(
+    const base::ListValue* args) {
+  int new_percent = -1;
+  args->GetInteger(0, &new_percent);
+}
+
+void DeviceEmulatorMessageHandler::HandleUpdatePowerSource(
+    const base::ListValue* args) {
+}