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

base/files/memory_mapped_file.cc

Index: base/files/memory_mapped_file.cc
diff --git a/base/files/memory_mapped_file.cc b/base/files/memory_mapped_file.cc
index 745a5ff1f4524f944823c244249836b6b52bf9a3..2d6ea71e8621297e9ad05b681187bb8217f32454 100644
--- a/base/files/memory_mapped_file.cc
+++ b/base/files/memory_mapped_file.cc
@@ -42,7 +42,7 @@ bool MemoryMappedFile::Initialize(const FilePath& file_name) {
     return false;
   }
 
-  if (!MapFileRegionToMemory(Region::kWholeFile)) {
+  if (!MapFileRegionToMemory(Region::kWholeFile, false)) {
     CloseHandles();
     return false;
   }
@@ -51,16 +51,24 @@ bool MemoryMappedFile::Initialize(const FilePath& file_name) {
 }
 
 bool MemoryMappedFile::Initialize(File file) {
-  return Initialize(file.Pass(), Region::kWholeFile);
+  return Initialize(file.Pass(), Region::kWholeFile, false);
 }
 
 bool MemoryMappedFile::Initialize(File file, const Region& region) {
+  return Initialize(file.Pass(), region, false);
+}
+
+bool MemoryMappedFile::Initialize(File file, bool write) {
+  return Initialize(file.Pass(), Region::kWholeFile, write);
+}
+
+bool MemoryMappedFile::Initialize(File file, const Region& region, bool write) {
   if (IsValid())
     return false;
 
   file_ = file.Pass();
 
-  if (!MapFileRegionToMemory(region)) {
+  if (!MapFileRegionToMemory(region, write)) {
     CloseHandles();
     return false;
   }