DevTools: allow passing command line flags into devtools front-end.

chrome/browser/devtools/devtools_window.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/devtools/devtools_window.h"
 
 #include <algorithm>
 
 #include "base/command_line.h"
 #include "base/json/json_reader.h"
@@ skipping 181 matching lines @@
   return NULL;
 }
 
 // static
 GURL DecorateFrontendURL(const GURL& base_url) {
   std::string frontend_url = base_url.spec();
   std::string url_string(
       frontend_url +
       ((frontend_url.find("?") == std::string::npos) ? "?" : "&") +
       "dockSide=undocked"); // TODO(dgozman): remove this support in M38.
-  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kEnableDevToolsExperiments))
+  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
+  if (command_line->HasSwitch(switches::kEnableDevToolsExperiments))
     url_string += "&experiments=true";
+
+  if (command_line->HasSwitch(switches::kDevToolsFlags)) {
+    std::string flags = command_line->GetSwitchValueASCII(
+                            switches::kDevToolsFlags);
+    flags = net::EscapeQueryParamValue(flags, false);
+    url_string += "&flags=" + flags;
+  }
+
 #if defined(DEBUG_DEVTOOLS)
   url_string += "&debugFrontend=true";
 #endif  // defined(DEBUG_DEVTOOLS)
+
   return GURL(url_string);
 }
 
 }  // namespace
 
 // DevToolsEventForwarder -----------------------------------------------------
 
 class DevToolsEventForwarder {
  public:
   explicit DevToolsEventForwarder(DevToolsWindow* window)
@@ skipping 1143 matching lines @@
 bool DevToolsWindow::ReloadInspectedWebContents(bool bypass_cache) {
   // Only route reload via front-end if the agent is attached.
   WebContents* wc = GetInspectedWebContents();
   if (!wc || wc->GetCrashedStatus() != base::TERMINATION_STATUS_STILL_RUNNING)
     return false;
   base::FundamentalValue bypass_cache_value(bypass_cache);
   bindings_->CallClientFunction("DevToolsAPI.reloadInspectedPage",
                                 &bypass_cache_value, nullptr, nullptr);
   return true;
 }