Avoid sync IPCs for FileSystem API

chrome/common/render_messages.h

Index: chrome/common/render_messages.h
diff --git a/chrome/common/render_messages.h b/chrome/common/render_messages.h
index aef972780f45f16b67350ddce4eebf98663a7481..ba3c6e10fe2251942da73afd7fc6b9588bf2019e 100644
--- a/chrome/common/render_messages.h
+++ b/chrome/common/render_messages.h
@@ -368,6 +368,11 @@ IPC_MESSAGE_ROUTED1(ChromeViewMsg_SetAllowRunningInsecureContent,
 
 IPC_MESSAGE_ROUTED0(ChromeViewMsg_ReloadFrame)
 
+// Tells the renderer whether or not a file system access has been allowed.
+IPC_MESSAGE_ROUTED2(ChromeViewMsg_RequestFileSystemAccessResponse,
+                    int  /* request_id */,
+                    bool /* allowed */)
+
 // Sent when the profile changes the kSafeBrowsingEnabled preference.
 IPC_MESSAGE_ROUTED1(ChromeViewMsg_SetClientSidePhishingDetection,
                     bool /* enable_phishing_detection */)
@@ -491,6 +496,13 @@ IPC_SYNC_MESSAGE_CONTROL3_1(ChromeViewHostMsg_AllowFileSystem,
                             GURL /* top origin url */,
                             bool /* allowed */)
 
+// Sent by the renderer process to check whether access to FileSystem is
+// granted by content settings.
+IPC_MESSAGE_ROUTED3(ChromeViewHostMsg_RequestFileSystemAccess,
+                    int /* request_id */,
+                    GURL /* origin_url */,
+                    GURL /* top origin url */)
+
 // Sent by the renderer process to check whether access to Indexed DBis
 // granted by content settings.
 IPC_SYNC_MESSAGE_CONTROL4_1(ChromeViewHostMsg_AllowIndexedDB,