Plugin Power Saver: Add comprehensive browser tests.

ppapi/tests/power_saver_test_plugin.cc

+// 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 <algorithm>
+
+#include "ppapi/cpp/instance.h"
+#include "ppapi/cpp/module.h"
+#include "ppapi/cpp/var.h"
+#include "ppapi/cpp/var_dictionary.h"
+#include "ppapi/tests/test_utils.h"
+
+// Windows defines 'PostMessage', so we have to undef it.
+#ifdef PostMessage
+#undef PostMessage
+#endif
+
+// This is a simple C++ Pepper plugin that enables Plugin Power Saver tests.
+class PowerSaverTestInstance : public pp::Instance {
+ public:
+  explicit PowerSaverTestInstance(PP_Instance instance)
+      : pp::Instance(instance), received_first_did_change_view_(false) {}
+  ~PowerSaverTestInstance() override {}
+
+  // For browser tests, responds to:
+  //  - When postMessage("isPeripheral") is called on the plugin DOM element.
+  //  - When the plugin throttler posts a message notifying us that our
+  //    peripheral status has changed.
+  void HandleMessage(const pp::Var& message_data) override {
+    if (message_data.is_string()) {
+      if (message_data.AsString() == "getPeripheralStatus")
+        BroadcastIsPeripheralStatus("getPeripheralStatusResponse");
+      else if (message_data.AsString() == "peripheralStatusChange")
+        BroadcastIsPeripheralStatus("peripheralStatusChange");
+    }
+  }
+
+  // Broadcast our peripheral status after the initial view data. This is for
+  // tests that await initial plugin creation.
+  void DidChangeView(const pp::View& view) override {
+    if (!received_first_did_change_view_) {
+      BroadcastIsPeripheralStatus("initial");
+      received_first_did_change_view_ = true;
+    }
+  }
+
+ private:
+  void BroadcastIsPeripheralStatus(const std::string& source) {
+    pp::VarDictionary message;
+    message.Set(
+        "isPeripheral",
+        pp::Var(PP_ToBool(GetTestingInterface()->IsPeripheral(pp_instance()))));
+    message.Set("source", pp::Var(source));
+    PostMessage(message);
+  }
+
+  bool received_first_did_change_view_;
+};
+
+class PowerSaverTestModule : public pp::Module {
+ public:
+  PowerSaverTestModule() : pp::Module() {}
+  virtual ~PowerSaverTestModule() {}
+
+  virtual pp::Instance* CreateInstance(PP_Instance instance) {
+    return new PowerSaverTestInstance(instance);
+  }
+};
+
+namespace pp {
+
+Module* CreateModule() {
+  return new PowerSaverTestModule();
+}
+
+}  // namespace pp