Revert of Use std::unique_ptr<> to pass frame ownership in DesktopCapturer impls.

webrtc/modules/desktop_capture/shared_desktop_frame.cc

Index: webrtc/modules/desktop_capture/shared_desktop_frame.cc
diff --git a/webrtc/modules/desktop_capture/shared_desktop_frame.cc b/webrtc/modules/desktop_capture/shared_desktop_frame.cc
index e069a54d0284eabc3b005774569dcbdb2018606a..8d10827e29cc2b78d472e8c28beaeb90064f1b81 100644
--- a/webrtc/modules/desktop_capture/shared_desktop_frame.cc
+++ b/webrtc/modules/desktop_capture/shared_desktop_frame.cc
@@ -17,25 +17,49 @@
 
 namespace webrtc {
 
+class SharedDesktopFrame::Core {
+ public:
+  Core(DesktopFrame* frame) : frame_(frame) {}
+
+  DesktopFrame* frame() { return frame_.get(); }
+
+  bool HasOneRef() { return ref_count_.Value() == 1; }
+
+  virtual int32_t AddRef() {
+    return ++ref_count_;
+  }
+
+  virtual int32_t Release() {
+    int32_t ref_count;
+    ref_count = --ref_count_;
+    if (ref_count == 0)
+      delete this;
+    return ref_count;
+  }
+
+ private:
+  virtual ~Core() {}
+
+  Atomic32 ref_count_;
+  std::unique_ptr<DesktopFrame> frame_;
+
+  RTC_DISALLOW_COPY_AND_ASSIGN(Core);
+};
+
 SharedDesktopFrame::~SharedDesktopFrame() {}
 
 // static
-std::unique_ptr<SharedDesktopFrame> SharedDesktopFrame::Wrap(
-    std::unique_ptr<DesktopFrame> desktop_frame) {
-  return std::unique_ptr<SharedDesktopFrame>(
-      new SharedDesktopFrame(new Core(desktop_frame.release())));
-}
-
 SharedDesktopFrame* SharedDesktopFrame::Wrap(DesktopFrame* desktop_frame) {
-  return Wrap(std::unique_ptr<DesktopFrame>(desktop_frame)).release();
+  rtc::scoped_refptr<Core> core(new Core(desktop_frame));
+  return new SharedDesktopFrame(core);
 }
 
 DesktopFrame* SharedDesktopFrame::GetUnderlyingFrame() {
-  return core_->get();
+  return core_->frame();
 }
 
-std::unique_ptr<SharedDesktopFrame> SharedDesktopFrame::Share() {
-  std::unique_ptr<SharedDesktopFrame> result(new SharedDesktopFrame(core_));
+SharedDesktopFrame* SharedDesktopFrame::Share() {
+  SharedDesktopFrame* result = new SharedDesktopFrame(core_);
   result->set_dpi(dpi());
   result->set_capture_time_ms(capture_time_ms());
   *result->mutable_updated_region() = updated_region();
@@ -47,10 +71,11 @@
 }
 
 SharedDesktopFrame::SharedDesktopFrame(rtc::scoped_refptr<Core> core)
-    : DesktopFrame((*core)->size(),
-                   (*core)->stride(),
-                   (*core)->data(),
-                   (*core)->shared_memory()),
-      core_(core) {}
+    : DesktopFrame(core->frame()->size(),
+                   core->frame()->stride(),
+                   core->frame()->data(),
+                   core->frame()->shared_memory()),
+      core_(core) {
+}
 
 }  // namespace webrtc