Added member data to classes to support download resumption.

content/browser/download/base_file.cc

Index: content/browser/download/base_file.cc
diff --git a/content/browser/download/base_file.cc b/content/browser/download/base_file.cc
index 51121001de8b64534119d8a7fb99411b77f7e324..db4b5a19a8808b355169dc1546e717fa29871c06 100644
--- a/content/browser/download/base_file.cc
+++ b/content/browser/download/base_file.cc
@@ -383,11 +383,21 @@ void BaseFile::Finish() {
   Close();
 }
 
+bool BaseFile::SetSha256Hash(const std::string& hash) {
+  DCHECK(!detached_);
+  DCHECK(hash.size() == kSha256HashLen);
+  if (!calculate_hash_)
+    return false;
+  memset(sha256_hash_, 0, kSha256HashLen);
+  memcpy(sha256_hash_, hash.c_str(), kSha256HashLen);
+  return true;
+}
+
 bool BaseFile::GetSha256Hash(std::string* hash) {
   DCHECK(!detached_);
   hash->assign(reinterpret_cast<const char*>(sha256_hash_),
                sizeof(sha256_hash_));
-  return (calculate_hash_ && !in_progress());
+  return (calculate_hash_);
 }
 
 bool BaseFile::IsEmptySha256Hash(const std::string& hash) {