Support sending a sliced file in chromium....

net/base/upload_data.h

Index: net/base/upload_data.h
===================================================================
--- net/base/upload_data.h	(revision 42417)
+++ net/base/upload_data.h	(working copy)
@@ -10,6 +10,7 @@
 #include "base/basictypes.h"
 #include "base/file_path.h"
 #include "base/ref_counted.h"
+#include "base/time.h"
 #include "testing/gtest/include/gtest/gtest_prod.h"
 
 namespace net {
@@ -35,6 +36,10 @@
     const FilePath& file_path() const { return file_path_; }
     uint64 file_range_offset() const { return file_range_offset_; }
     uint64 file_range_length() const { return file_range_length_; }
+    // If NULL time is returned, we do not do the check.
+    const base::Time& expected_file_modification_time() const {
+      return expected_file_modification_time_;
+    }
 
     void SetToBytes(const char* bytes, int bytes_len) {
       type_ = TYPE_BYTES;
@@ -42,15 +47,20 @@
     }
 
     void SetToFilePath(const FilePath& path) {
-      SetToFilePathRange(path, 0, kuint64max);
+      SetToFilePathRange(path, 0, kuint64max, base::Time());
     }
 
+    // If expected_modification_time is NULL, we do not check for the file
+    // change. Also note that the granularity for comparison is time_t, not
+    // the full precision.
     void SetToFilePathRange(const FilePath& path,
-                            uint64 offset, uint64 length) {
+                            uint64 offset, uint64 length,
+                            const base::Time& expected_modification_time) {
       type_ = TYPE_FILE;
       file_path_ = path;
       file_range_offset_ = offset;
       file_range_length_ = length;
+      expected_file_modification_time_ = expected_modification_time;
     }
 
     // Returns the byte-length of the element.  For files that do not exist, 0
@@ -69,6 +79,7 @@
     FilePath file_path_;
     uint64 file_range_offset_;
     uint64 file_range_length_;
+    base::Time expected_file_modification_time_;
     bool override_content_length_;
     uint64 content_length_;
 
@@ -89,9 +100,11 @@
   }
 
   void AppendFileRange(const FilePath& file_path,
-                       uint64 offset, uint64 length) {
+                       uint64 offset, uint64 length,
+                       const base::Time& expected_modification_time) {
     elements_.push_back(Element());
-    elements_.back().SetToFilePathRange(file_path, offset, length);
+    elements_.back().SetToFilePathRange(file_path, offset, length,
+                                        expected_modification_time);
   }
 
   // Returns the total size in bytes of the data to upload.