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..685d0ed96e273be6535d31b05c54a5a6f05198c8 100644
--- a/content/browser/download/base_file.cc
+++ b/content/browser/download/base_file.cc
@@ -193,6 +193,7 @@ BaseFile::BaseFile(const FilePath& full_path,
                    const GURL& source_url,
                    const GURL& referrer_url,
                    int64 received_bytes,
+                   const Pickle& hash_state,
                    const linked_ptr<net::FileStream>& file_stream)
     : full_path_(full_path),
       source_url_(source_url),
@@ -201,6 +202,7 @@ BaseFile::BaseFile(const FilePath& full_path,
       bytes_so_far_(received_bytes),
       power_save_blocker_(PowerSaveBlocker::kPowerSaveBlockPreventSystemSleep),
       calculate_hash_(false),
+      initial_hash_state_(hash_state),
       detached_(false) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
   memcpy(sha256_hash_, kEmptySha256Hash, kSha256HashLen);
@@ -222,8 +224,11 @@ net::Error BaseFile::Initialize(bool calculate_hash) {
 
   calculate_hash_ = calculate_hash;
 
-  if (calculate_hash_)
+  if (calculate_hash_) {
     secure_hash_.reset(crypto::SecureHash::Create(crypto::SecureHash::SHA256));
+    if ((initial_hash_state_.size() != 0) && (bytes_so_far_ > 0))
+      SetSha256HashState(&initial_hash_state_);
+  }
 
   if (full_path_.empty()) {
     FilePath temp_file;
@@ -387,7 +392,16 @@ 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::GetSha256HashState(Pickle* hash_state) {
+  return secure_hash_->Serialize(hash_state);
+}
+
+bool BaseFile::SetSha256HashState(Pickle* hash_state) {
+  void* data_iterator = NULL;
+  return secure_hash_->Deserialize(&data_iterator, hash_state);
 }
 
 bool BaseFile::IsEmptySha256Hash(const std::string& hash) {