[Mojo Video Capture] Adapt video_capture service to refactored video capture stack

media/capture/video/shared_memory_buffer_tracker.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/capture/video/shared_memory_buffer_tracker.h"
 
 #include "base/memory/ptr_util.h"
+#include "media/capture/video/shared_memory_buffer_handle.h"
 #include "mojo/public/cpp/system/platform_handle.h"
 
 namespace media {
 
 SharedMemoryBufferTracker::SharedMemoryBufferTracker()
     : VideoCaptureBufferTracker() {}
 
 bool SharedMemoryBufferTracker::Init(const gfx::Size& dimensions,
                                      VideoPixelFormat format,
                                      VideoPixelStorage storage_type,
                                      base::Lock* lock) {
   DVLOG(2) << __func__ << "allocating ShMem of " << dimensions.ToString();
   set_dimensions(dimensions);
   // |dimensions| can be 0x0 for trackers that do not require memory backing.
   set_max_pixel_count(dimensions.GetArea());
   set_pixel_format(format);
   set_storage_type(storage_type);
   mapped_size_ = VideoCaptureFormat(dimensions, 0.0f, format, storage_type)
                      .ImageAllocationSize();
   if (!mapped_size_)
     return true;
   return shared_memory_.CreateAndMapAnonymous(mapped_size_);
 }
 
 std::unique_ptr<VideoCaptureBufferHandle>
 SharedMemoryBufferTracker::GetMemoryMappedAccess() {
-  return base::MakeUnique<SharedMemoryBufferHandle>(this);
+  return base::MakeUnique<SharedMemoryBufferHandle>(&shared_memory_,
+                                                    mapped_size_);
 }
 
 mojo::ScopedSharedBufferHandle
 SharedMemoryBufferTracker::GetHandleForTransit() {
   return mojo::WrapSharedMemoryHandle(
       base::SharedMemory::DuplicateHandle(shared_memory_.handle()),
       mapped_size_, false /* read_only */);
 }
 
 base::SharedMemoryHandle
 SharedMemoryBufferTracker::GetNonOwnedSharedMemoryHandleForLegacyIPC() {
   return shared_memory_.handle();
 }
 
-SharedMemoryBufferHandle::SharedMemoryBufferHandle(
-    SharedMemoryBufferTracker* tracker)
-    : tracker_(tracker) {}
-
-SharedMemoryBufferHandle::~SharedMemoryBufferHandle() = default;
-
-size_t SharedMemoryBufferHandle::mapped_size() const {
-  return tracker_->mapped_size_;
-}
-
-uint8_t* SharedMemoryBufferHandle::data() {
-  return static_cast<uint8_t*>(tracker_->shared_memory_.memory());
-}
-
-const uint8_t* SharedMemoryBufferHandle::data() const {
-  return static_cast<const uint8_t*>(tracker_->shared_memory_.memory());
-}
-
 }  // namespace media