Sparse IO: Allow failover to network in debug builds

net/http/mock_http_cache.h

Index: net/http/mock_http_cache.h
diff --git a/net/http/mock_http_cache.h b/net/http/mock_http_cache.h
index 6cb0e50f56287db00afc8a118f937810e1af684a..90399ec4ff006f29c7d324c6ba91c63a11c06a91 100644
--- a/net/http/mock_http_cache.h
+++ b/net/http/mock_http_cache.h
@@ -21,7 +21,6 @@
 class MockDiskEntry : public disk_cache::Entry,
                       public base::RefCounted<MockDiskEntry> {
  public:
-  MockDiskEntry();
   explicit MockDiskEntry(const std::string& key);
 
   bool is_doomed() const { return doomed_; }
@@ -53,6 +52,8 @@ class MockDiskEntry : public disk_cache::Entry,
   // Fail most subsequent requests.
   void set_fail_requests() { fail_requests_ = true; }
 
+  void set_fail_sparse_requests() { fail_sparse_requests_ = true; }
+
   // If |value| is true, don't deliver any completion callbacks until called
   // again with |value| set to false.  Caution: remember to enable callbacks
   // again or all subsequent tests will fail.
@@ -85,6 +86,7 @@ class MockDiskEntry : public disk_cache::Entry,
   bool doomed_;
   bool sparse_;
   bool fail_requests_;
+  bool fail_sparse_requests_;
   bool busy_;
   bool delayed_;
   static bool cancel_;
@@ -134,6 +136,9 @@ class MockDiskCache : public disk_cache::Backend {
   // Makes sure that CreateEntry is not called twice for a given key.
   void set_double_create_check(bool value) { double_create_check_ = value; }
 
+  // Makes all requests for data ranges to fail as not implemented.
+  void set_fail_sparse_requests() { fail_sparse_requests_ = true; }
+
   void ReleaseAll();
 
  private:
@@ -147,6 +152,7 @@ class MockDiskCache : public disk_cache::Backend {
   bool fail_requests_;
   bool soft_failures_;
   bool double_create_check_;
+  bool fail_sparse_requests_;
 };
 
 class MockBackendFactory : public net::HttpCache::BackendFactory {