Make VEA test support videos with different coded size and visible size

base/files/memory_mapped_file.h

Index: base/files/memory_mapped_file.h
diff --git a/base/files/memory_mapped_file.h b/base/files/memory_mapped_file.h
index 8a7f045f351a0365d496f37f5824607cacfdc12e..17ffb80a25302a5d850fd84fca714966c49511a5 100644
--- a/base/files/memory_mapped_file.h
+++ b/base/files/memory_mapped_file.h
@@ -48,7 +48,6 @@ class BASE_EXPORT MemoryMappedFile {
   // read only. If this object already points to a valid memory mapped file
   // then this method will fail and return false. If it cannot open the file,
   // the file does not exist, or the memory mapping fails, it will return false.
-  // Later we may want to allow the user to specify access.
   bool Initialize(const FilePath& file_name);
 
   // As above, but works with an already-opened file. MemoryMappedFile takes
@@ -58,18 +57,29 @@ class BASE_EXPORT MemoryMappedFile {
   // As above, but works with a region of an already-opened file.
   bool Initialize(File file, const Region& region);
 
+  // As above, works with an already-opened file and enables write permission
+  // when |write| is true.
+  bool Initialize(File file, bool write);
+
+  // As above, but works with a region of an already-opened file and enables
+  // write permission when |write| is true.
+  bool Initialize(File file, const Region& region, bool write);
+
 #if defined(OS_WIN)
   // Opens an existing file and maps it as an image section. Please refer to
   // the Initialize function above for additional information.
   bool InitializeAsImageSection(const FilePath& file_name);
 #endif  // OS_WIN
 
-  const uint8* data() const { return data_; }
+  uint8* data() const { return data_; }
   size_t length() const { return length_; }
 
   // Is file_ a valid file handle that points to an open, memory mapped file?
   bool IsValid() const;
 
+  // Closes all open handles.
+  void CloseHandles();

[wuchengli, 2014/09/01 06:57:15]

We shouldn't expose an API for the testing purpose. Please rearrange the test
code to avoid calling this.

[henryhsu, 2014/09/01 07:49:49]

Done.

+
  private:
   // Given the arbitrarily aligned memory region [start, size], returns the
   // boundaries of the region aligned to the granularity specified by the OS,
@@ -85,10 +95,8 @@ class BASE_EXPORT MemoryMappedFile {
 
   // Map the file to memory, set data_ to that memory address. Return true on
   // success, false on any kind of failure. This is a helper for Initialize().
-  bool MapFileRegionToMemory(const Region& region);
-
-  // Closes all open handles.
-  void CloseHandles();
+  // - |write| is used to enable write permission of mmap.
+  bool MapFileRegionToMemory(const Region& region, bool write);
 
   File file_;
   uint8* data_;