DoomPartialEntry should not attempt to doom an already doomed entry.

net/http/mock_http_cache.cc

Index: net/http/mock_http_cache.cc
diff --git a/net/http/mock_http_cache.cc b/net/http/mock_http_cache.cc
index 514cc4208f82c79b3cafb876ef027716fd69b09f..bf81c4ee1eea6f6c14f5ff5544c7a31184b507cc 100644
--- a/net/http/mock_http_cache.cc
+++ b/net/http/mock_http_cache.cc
@@ -74,7 +74,9 @@ MockDiskEntry::MockDiskEntry(const std::string& key)
       fail_sparse_requests_(false),
       busy_(false),
       delayed_(false),
-      cancel_(false) {
+      cancel_(false),
+      defer_op_(DEFER_NONE),
+      resume_return_code_(0) {
   test_mode_ = GetTestModeForEntry(key);
 }
 
@@ -125,10 +127,25 @@ int MockDiskEntry::ReadData(int index,
   if (MockHttpCache::GetTestMode(test_mode_) & TEST_MODE_SYNC_CACHE_READ)
     return num;
 
+  // Pause and resume.
+  if (defer_op_ == DEFER_READ) {
+    defer_op_ = DEFER_NONE;
+    resume_callback_ = callback;
+    resume_return_code_ = num;
+    return ERR_IO_PENDING;
+  }
+
   CallbackLater(callback, num);
   return ERR_IO_PENDING;
 }
 
+void MockDiskEntry::ResumeDiskEntryOperation() {
+  DCHECK(!resume_callback_.is_null());
+  CallbackLater(resume_callback_, resume_return_code_);
+  resume_callback_.Reset();
+  resume_return_code_ = 0;
+}
+
 int MockDiskEntry::WriteData(int index,
                              int offset,
                              IOBuffer* buf,
@@ -376,7 +393,9 @@ MockDiskCache::MockDiskCache()
       fail_requests_(false),
       soft_failures_(false),
       double_create_check_(true),
-      fail_sparse_requests_(false) {}
+      fail_sparse_requests_(false),
+      defer_op_(MockDiskEntry::DEFER_NONE),
+      resume_return_code_(0) {}
 
 MockDiskCache::~MockDiskCache() {
   ReleaseAll();
@@ -460,6 +479,14 @@ int MockDiskCache::CreateEntry(const std::string& key,
   if (GetTestModeForEntry(key) & TEST_MODE_SYNC_CACHE_START)
     return OK;
 
+  // Pause and resume.
+  if (defer_op_ == MockDiskEntry::DEFER_CREATE) {
+    defer_op_ = MockDiskEntry::DEFER_NONE;
+    resume_callback_ = callback;
+    resume_return_code_ = OK;
+    return ERR_IO_PENDING;
+  }
+
   CallbackLater(callback, OK);
   return ERR_IO_PENDING;
 }
@@ -526,9 +553,8 @@ size_t MockDiskCache::DumpMemoryStats(
 }
 
 void MockDiskCache::ReleaseAll() {
-  EntryMap::iterator it = entries_.begin();
-  for (; it != entries_.end(); ++it)
-    it->second->Release();
+  for (auto entry : entries_)
+    entry.second->Release();
   entries_.clear();
 }
 
@@ -540,9 +566,25 @@ void MockDiskCache::CallbackLater(const CompletionCallback& callback,
 
 bool MockDiskCache::IsDiskEntryDoomed(const std::string& key) {
   auto it = entries_.find(key);
+  if (it != entries_.end())
+    return it->second->is_doomed();
+
+  return false;
+}
+
+void MockDiskCache::ResumeCacheOperation() {
+  DCHECK(!resume_callback_.is_null());
+  CallbackLater(resume_callback_, resume_return_code_);
+  resume_callback_.Reset();
+  resume_return_code_ = 0;
+}
+
+scoped_refptr<MockDiskEntry> MockDiskCache::GetDiskEntryRef(
+    const std::string& key) {
+  auto it = entries_.find(key);
   if (it == entries_.end())
-    return false;
-  return it->second->is_doomed();
+    return nullptr;
+  return it->second;
 }
 
 //-----------------------------------------------------------------------------