Adding drawable to CRD andorid and iOS gl rendering pipeline.

remoting/client/gl_desktop.cc

Index: remoting/client/gl_desktop.cc
diff --git a/remoting/client/gl_desktop.cc b/remoting/client/gl_desktop.cc
index 72bd9ec15201e615fb2ab46b146e63ce180fe265..6b331b108d404b4cbd58cd4b90152e48345f8a3a 100644
--- a/remoting/client/gl_desktop.cc
+++ b/remoting/client/gl_desktop.cc
@@ -57,7 +57,9 @@ struct GlDesktop::GlDesktopTextureContainer {
   webrtc::DesktopRect rect;
 };
 
-GlDesktop::GlDesktop() {}
+GlDesktop::GlDesktop() : weak_factory_(this) {
+  SetZIndex(DrawableZIndex::DESKTOP);
+}
 
 GlDesktop::~GlDesktop() {}
 
@@ -83,12 +85,13 @@ void GlDesktop::SetVideoFrame(const webrtc::DesktopFrame& frame) {
   }
 }
 
-void GlDesktop::Draw() {
+bool GlDesktop::Draw() {
   if (!textures_.empty() && !last_desktop_size_.is_empty()) {
     for (std::unique_ptr<GlDesktopTextureContainer>& texture : textures_) {
       texture->layer->Draw(1.0f);
     }
   }
+  return false;
 }
 
 void GlDesktop::ReallocateTextures(const webrtc::DesktopSize& size) {
@@ -124,4 +127,8 @@ void GlDesktop::ReallocateTextures(const webrtc::DesktopSize& size) {
   }
 }
 
+base::WeakPtr<GlDrawable> GlDesktop::GetWeakPtr() {
+  return weak_factory_.GetWeakPtr();
+}
+
 }  // namespace remoting