Support file system access in DevTools with isolated file system.

content/browser/devtools/devtools_frontend_host.cc

Index: content/browser/devtools/devtools_frontend_host.cc
diff --git a/content/browser/devtools/devtools_frontend_host.cc b/content/browser/devtools/devtools_frontend_host.cc
index f16dcdfd1346a9a68a7f7dd11cd021d5098d0e3d..a8899b207a326558c8c4face8e2c9fdeae11c238 100644
--- a/content/browser/devtools/devtools_frontend_host.cc
+++ b/content/browser/devtools/devtools_frontend_host.cc
@@ -70,6 +70,10 @@ bool DevToolsFrontendHost::OnMessageReceived(
     IPC_MESSAGE_HANDLER(DevToolsHostMsg_OpenInNewTab, OnOpenInNewTab)
     IPC_MESSAGE_HANDLER(DevToolsHostMsg_Save, OnSave)
     IPC_MESSAGE_HANDLER(DevToolsHostMsg_Append, OnAppend)
+    IPC_MESSAGE_HANDLER(DevToolsHostMsg_RequestFilesystems,
+                        OnRequestFilesystems)
+    IPC_MESSAGE_HANDLER(DevToolsHostMsg_AddFilesystem, OnAddFilesystem)
+    IPC_MESSAGE_HANDLER(DevToolsHostMsg_RemoveFilesystem, OnRemoveFilesystem)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -110,6 +114,19 @@ void DevToolsFrontendHost::OnAppend(
   delegate_->AppendToFile(url, content);
 }
 
+void DevToolsFrontendHost::OnRequestFilesystems() {
+  delegate_->RequestFilesystems();
+}
+
+void DevToolsFrontendHost::OnAddFilesystem() {
+  delegate_->AddFilesystem();
+}
+
+void DevToolsFrontendHost::OnRemoveFilesystem(
+    const std::string& file_system_path) {
+  delegate_->RemoveFilesystem(file_system_path);
+}
+
 void DevToolsFrontendHost::OnRequestSetDockSide(const std::string& side) {
   delegate_->SetDockSide(side);
 }