Experimentally isolate GetSaveFileName in a utility process.

chrome/common/chrome_utility_messages.h

Index: chrome/common/chrome_utility_messages.h
diff --git a/chrome/common/chrome_utility_messages.h b/chrome/common/chrome_utility_messages.h
index 352d12bf4dd3e058232de09e6e7e17f682d4b1e8..7473a4d39c4f7519388472fb31e9e52d4f1d44da 100644
--- a/chrome/common/chrome_utility_messages.h
+++ b/chrome/common/chrome_utility_messages.h
@@ -36,6 +36,25 @@ IPC_STRUCT_TRAITS_BEGIN(safe_browsing::zip_analyzer::Results)
   IPC_STRUCT_TRAITS_MEMBER(has_archive)
 IPC_STRUCT_TRAITS_END()
 
+#if defined(OS_WIN)
+
+// A vector of filters, each being a Tuple2 containing a display string (i.e.
+// "Text Files") and a filter pattern (i.e. "*.txt").
+typedef std::vector<Tuple2<base::string16, base::string16> >
+    GetOpenFileNameFilter;
+
+IPC_STRUCT_BEGIN(ChromeUtilityMsg_GetSaveFileName_Params)
+  IPC_STRUCT_MEMBER(HWND, owner)
+  IPC_STRUCT_MEMBER(DWORD, flags)
+  IPC_STRUCT_MEMBER(GetOpenFileNameFilter, filters)
+  IPC_STRUCT_MEMBER(int, one_based_filter_index)
+  IPC_STRUCT_MEMBER(base::FilePath, suggested_filename)
+  IPC_STRUCT_MEMBER(base::FilePath, initial_directory)
+  IPC_STRUCT_MEMBER(base::string16, default_extension)
+IPC_STRUCT_END()
+
+#endif  // OS_WIN
+
 //------------------------------------------------------------------------------
 // Utility process messages:
 // These are messages from the browser to the utility process.
@@ -94,11 +113,6 @@ IPC_MESSAGE_CONTROL1(ChromeUtilityMsg_AnalyzeZipFileForDownloadProtection,
 IPC_MESSAGE_CONTROL1(ChromeUtilityMsg_OpenItemViaShell,
                      base::FilePath /* full_path */)
 
-// A vector of filters, each being a Tuple2a display string (i.e. "Text Files")
-// and a filter pattern (i.e. "*.txt")..
-typedef std::vector<Tuple2<base::string16, base::string16> >
-    GetOpenFileNameFilter;
-
 // Instructs the utility process to invoke GetOpenFileName. |owner| is the
 // parent of the modal dialog, |flags| are OFN_* flags. |filter| constrains the
 // user's file choices. |initial_directory| and |filename| select the directory
@@ -113,6 +127,8 @@ IPC_MESSAGE_CONTROL5(ChromeUtilityMsg_GetOpenFileName,
                      GetOpenFileNameFilter /* filter */,
                      base::FilePath /* initial_directory */,
                      base::FilePath /* filename */)
+IPC_MESSAGE_CONTROL1(ChromeUtilityMsg_GetSaveFileName,
+                     ChromeUtilityMsg_GetSaveFileName_Params /* params */)
 #endif  // defined(OS_WIN)
 
 //------------------------------------------------------------------------------
@@ -163,4 +179,8 @@ IPC_MESSAGE_CONTROL0(ChromeUtilityHostMsg_GetOpenFileName_Failed)
 IPC_MESSAGE_CONTROL2(ChromeUtilityHostMsg_GetOpenFileName_Result,
                      base::FilePath /* directory */,
                      std::vector<base::FilePath> /* filenames */)
+IPC_MESSAGE_CONTROL0(ChromeUtilityHostMsg_GetSaveFileName_Failed)
+IPC_MESSAGE_CONTROL2(ChromeUtilityHostMsg_GetSaveFileName_Result,
+                     base::FilePath /* path */,
+                     int /* one_based_filter_index  */)
 #endif  // defined(OS_WIN)