DevTools: allow storing devtools preferences on the browser side.

content/shell/browser/shell_devtools_frontend.cc

Index: content/shell/browser/shell_devtools_frontend.cc
diff --git a/content/shell/browser/shell_devtools_frontend.cc b/content/shell/browser/shell_devtools_frontend.cc
index a80490d48438b21ee9ea7e0f14f5646ca87319d2..6d8e163f34b2f533ec8a67296b878aeff4521372 100644
--- a/content/shell/browser/shell_devtools_frontend.cc
+++ b/content/shell/browser/shell_devtools_frontend.cc
@@ -224,6 +224,22 @@ void ShellDevToolsFrontend::HandleMessageFromDevToolsFrontend(
         new ResponseWriter(weak_factory_.GetWeakPtr(), stream_id)));
     fetcher->Start();
     return;
+  } else if (method == "getPreferences") {
+    SendMessageAck(request_id, &preferences_);
+    return;
+  } else if (method == "setPreference") {
+    std::string name;
+    std::string value;
+    if (!params->GetString(0, &name) ||
+        !params->GetString(1, &value)) {
+      return;
+    }
+    preferences_.SetStringWithoutPathExpansion(name, value);
+  } else if (method == "removePreference") {
+    std::string name;
+    if (!params->GetString(0, &name))
+      return;
+    preferences_.RemoveWithoutPathExpansion(name, nullptr);
   } else {
     return;
   }