Add webusb notification UI code

chrome/browser/chrome_browser_main.cc

 // 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 "chrome/browser/chrome_browser_main.h"
 
 #include <set>
 #include <string>
 #include <vector>
 
@@ skipping 219 matching lines @@
 #endif  // defined(ENABLE_RLZ)
 
 #if defined(ENABLE_WEBRTC)
 #include "chrome/browser/media/webrtc_log_util.h"
 #endif  // defined(ENABLE_WEBRTC)
 
 #if defined(USE_AURA)
 #include "ui/aura/env.h"
 #endif  // defined(USE_AURA)
 
+#if !defined(OS_ANDROID) && !defined(OS_IOS)
+#include "chrome/browser/chrome_webusb_browser_client.h"
+#include "components/webusb/webusb_detector.h"
+#endif
+
 using content::BrowserThread;
 
 namespace {
 
 // This function provides some ways to test crash and assertion handling
 // behavior of the program.
 void HandleTestParameters(const base::CommandLine& command_line) {
   // This parameter causes a null pointer crash (crash reporter trigger).
   if (command_line.HasSwitch(switches::kBrowserCrashTest)) {
     int* bad_pointer = NULL;
@@ skipping 922 matching lines @@
 #if defined(ENABLE_WEBRTC)
   // Set up a task to delete old WebRTC log files for all profiles. Use a delay
   // to reduce the impact on startup time.
   BrowserThread::PostDelayedTask(
       BrowserThread::UI,
       FROM_HERE,
       base::Bind(&WebRtcLogUtil::DeleteOldWebRtcLogFilesForAllProfiles),
       base::TimeDelta::FromMinutes(1));
 #endif  // defined(ENABLE_WEBRTC)
 
+#if !defined(OS_ANDROID) && !defined(OS_IOS)
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableWebUsbNotifications)) {
+    webusb_browser_client_.reset(new ChromeWebUsbBrowserClient());
+    webusb_detector_.reset(
+        new webusb::WebUsbDetector(webusb_browser_client_.get()));
+  }
+#endif
+
   // At this point, StartupBrowserCreator::Start has run creating initial
   // browser windows and tabs, but no progress has been made in loading
   // content as the main message loop hasn't started processing tasks yet.
   // We setup to observe to the initial page load here to defer running
   // task posted via PostAfterStartupTask until its complete.
   AfterStartupTaskUtils::StartMonitoringStartup();
 }
 
 int ChromeBrowserMainParts::PreMainMessageLoopRunImpl() {
   TRACE_EVENT0("startup", "ChromeBrowserMainParts::PreMainMessageLoopRunImpl");
@@ skipping 576 matching lines @@
       g_browser_process->local_state());
   shutdown_watcher_->Arm(base::TimeDelta::FromSeconds(300));
 
   // Disarm the startup hang detector time bomb if it is still Arm'ed.
   startup_watcher_->Disarm();
 
   // Remove observers attached to D-Bus clients before DbusThreadManager is
   // shut down.
   process_power_collector_.reset();
 
+#if !defined(OS_IOS)
+  webusb_browser_client_.reset();
+  webusb_detector_.reset();

[stevenjb, 2015/09/09 19:35:26]

Note: We should really reset the detector before the browser client since the
detector depends on the browser client. As-is if the detector code changes to
access the browser client in the destructor, a crash would likely be introduced.

[juncai, 2015/09/09 20:30:29]

Done in a new patch.

+#endif
+
   for (size_t i = 0; i < chrome_extra_parts_.size(); ++i)
     chrome_extra_parts_[i]->PostMainMessageLoopRun();
 
   // Some tests don't set parameters.ui_task, so they started translate
   // language fetch that was never completed so we need to cleanup here
   // otherwise it will be done by the destructor in a wrong thread.
   TranslateService::Shutdown(parameters().ui_task == NULL);
 
   if (notify_result_ == ProcessSingleton::PROCESS_NONE)
     process_singleton_->Cleanup();
@@ skipping 34 matching lines @@
   chromeos::CrosSettings::Shutdown();
 #endif  // defined(OS_CHROMEOS)
 #endif  // defined(OS_ANDROID)
 }
 
 // Public members:
 
 void ChromeBrowserMainParts::AddParts(ChromeBrowserMainExtraParts* parts) {
   chrome_extra_parts_.push_back(parts);
 }