[DevTools] Introduce a target discovery preference

chrome/browser/devtools/device/devtools_android_bridge_browsertest.cc

+// Copyright 2016 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 "base/values.h"
+#include "chrome/browser/devtools/device/devtools_android_bridge.h"
+#include "chrome/browser/devtools/device/tcp_device_provider.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/common/chrome_switches.h"
+#include "chrome/common/pref_names.h"
+#include "chrome/test/base/in_process_browser_test.h"
+#include "chrome/test/base/ui_test_utils.h"
+#include "components/prefs/pref_service.h"
+
+class DevToolsAndroidBridgeTest : public InProcessBrowserTest {
+};
+
+static void assign_from_callback(scoped_refptr<TCPDeviceProvider>* store,
+                                 int* invocation_counter,
+                                 scoped_refptr<TCPDeviceProvider> value) {
+  (*invocation_counter)++;
+  *store = value;
+}
+
+IN_PROC_BROWSER_TEST_F(DevToolsAndroidBridgeTest, UpdatesTargetDiscovery) {
+  Profile* profile = browser()->profile();
+
+  PrefService* service = profile->GetPrefs();
+  service->ClearPref(prefs::kDevToolsTargetDiscoveryConfig);
+
+  DevToolsAndroidBridge* bridge =
+      DevToolsAndroidBridge::Factory::GetForProfile(profile);
+
+  scoped_refptr<TCPDeviceProvider> provider;
+  int called = 0;
+  bridge->set_tcp_provider_callback_for_test(
+      base::Bind(assign_from_callback, &provider, &called));
+
+  EXPECT_LT(0, called);
+  EXPECT_EQ(nullptr, provider);
+
+  int invocations = called;
+  base::ListValue list;
+  list.AppendString("somehost:2000");
+
+  service->Set(prefs::kDevToolsTargetDiscoveryConfig, list);
+
+  EXPECT_LT(invocations, called);
+  EXPECT_NE(nullptr, provider);
+  std::set<net::HostPortPair> pairs = provider->get_targets_for_test();
+  EXPECT_EQ(1UL, pairs.size());
+  net::HostPortPair pair = *pairs.begin();
+  EXPECT_EQ(2000, pair.port());
+  EXPECT_EQ("somehost", pair.HostForURL());
+
+  invocations = called;
+  list.Clear();
+  service->Set(prefs::kDevToolsTargetDiscoveryConfig, list);
+
+  EXPECT_LT(invocations, called);
+  EXPECT_EQ(nullptr, provider);
+  invocations = called;
+
+  list.AppendString("b:1");
+  list.AppendString("c:2");
+  list.AppendString("<not really a good address.");
+  list.AppendString("d:3");
+  list.AppendString("c:2");
+  service->Set(prefs::kDevToolsTargetDiscoveryConfig, list);
+
+  EXPECT_LT(invocations, called);
+  EXPECT_NE(nullptr, provider);
+  pairs = provider->get_targets_for_test();
+  EXPECT_EQ(3UL, pairs.size());
+  for (const net::HostPortPair pair : pairs) {
+    EXPECT_EQ(pair.port(), pair.HostForURL()[0] - 'a');
+  }
+}