From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Cheng Zhao <zcbenz@gmail.com>
Date: Thu, 20 Sep 2018 17:48:49 -0700
Subject: mas: disable remote layer APIs (CAContext and CALayerHost) for MAS
 build

Accordin to ccameron:

For apps that spend a lot of time watching video (especially fullscreen video),
the power/battery usage will likely increase 1.5x to 2x. For something that is,
e.g, scrolling, it'll be smaller, more like 1.15x or 1.25x.

In terms of performance, the impact will likely be fairly small -- any app that
could hit 60fps before will likely still be able to hit 60fps. There may even be
cases where performance improves when disabling remote CoreAnimation (remote
CoreAnimation is really only about battery usage).

diff --git a/gpu/ipc/service/image_transport_surface_overlay_mac.h b/gpu/ipc/service/image_transport_surface_overlay_mac.h
index caeaaf96088709486688ba1ca231b928f600c3f1..27024e051cf9e7424c9187f6af5e3b03ca1edaf2 100644
--- a/gpu/ipc/service/image_transport_surface_overlay_mac.h
+++ b/gpu/ipc/service/image_transport_surface_overlay_mac.h
@@ -20,7 +20,9 @@
 #include "ui/gl/gl_surface_egl.h"
 #endif
 
+#ifndef MAS_BUILD
 @class CAContext;
+#endif
 @class CALayer;
 
 namespace ui {
@@ -119,7 +121,9 @@ class ImageTransportSurfaceOverlayMacBase : public BaseClass,
   base::WeakPtr<ImageTransportSurfaceDelegate> delegate_;
 
   bool use_remote_layer_api_;
+#ifndef MAS_BUILD
   base::scoped_nsobject<CAContext> ca_context_;
+#endif
   std::unique_ptr<ui::CALayerTreeCoordinator> ca_layer_tree_coordinator_;
 
   gfx::Size pixel_size_;
diff --git a/gpu/ipc/service/image_transport_surface_overlay_mac.mm b/gpu/ipc/service/image_transport_surface_overlay_mac.mm
index 54c5b7bcbe4ead3653bcea1f82ac34212d87392e..d7ce7c04e1fcab4949e1340901aacfac14bb383e 100644
--- a/gpu/ipc/service/image_transport_surface_overlay_mac.mm
+++ b/gpu/ipc/service/image_transport_surface_overlay_mac.mm
@@ -53,7 +53,7 @@
 
   ca_layer_tree_coordinator_ = std::make_unique<ui::CALayerTreeCoordinator>(
       use_remote_layer_api_, allow_av_sample_buffer_display_layer);
-
+#ifndef MAS_BUILD
   // Create the CAContext to send this to the GPU process, and the layer for
   // the context.
   if (use_remote_layer_api_) {
@@ -62,6 +62,7 @@
                                                    options:@{}] retain]);
     [ca_context_ setLayer:ca_layer_tree_coordinator_->GetCALayerForDisplay()];
   }
+#endif
 }
 
 template <typename BaseClass>
@@ -142,7 +143,9 @@
                          "GLImpl", static_cast<int>(gl::GetGLImplementation()),
                          "width", pixel_size_.width());
     if (use_remote_layer_api_) {
+#ifndef MAS_BUILD
       params.ca_layer_params.ca_context_id = [ca_context_ contextId];
+#endif
     } else {
       IOSurfaceRef io_surface =
           ca_layer_tree_coordinator_->GetIOSurfaceForDisplay();
diff --git a/ui/accelerated_widget_mac/display_ca_layer_tree.mm b/ui/accelerated_widget_mac/display_ca_layer_tree.mm
index a55934320e475af475f7169a5b30954c7e98d775..78d626f2c5be20106ebd54b71a9b0663c55086da 100644
--- a/ui/accelerated_widget_mac/display_ca_layer_tree.mm
+++ b/ui/accelerated_widget_mac/display_ca_layer_tree.mm
@@ -99,6 +99,7 @@ - (void)setContentsChanged;
 }
 
 void DisplayCALayerTree::GotCALayerFrame(uint32_t ca_context_id) {
+#ifndef MAS_BUILD
   // Early-out if the remote layer has not changed.
   if ([remote_layer_ contextId] == ca_context_id)
     return;
@@ -123,6 +124,9 @@ - (void)setContentsChanged;
     [io_surface_layer_ removeFromSuperlayer];
     io_surface_layer_.reset();
   }
+#else
+  NOTREACHED() << "Remote layer is being used in MAS build";
+#endif
 }
 
 void DisplayCALayerTree::GotIOSurfaceFrame(
diff --git a/ui/base/cocoa/remote_layer_api.h b/ui/base/cocoa/remote_layer_api.h
index d684614589c9e55965450d712ee6dc0deef6aade..e0446753a3d972215423c079160fe8bfd2f9c3be 100644
--- a/ui/base/cocoa/remote_layer_api.h
+++ b/ui/base/cocoa/remote_layer_api.h
@@ -13,6 +13,7 @@
 
 #include "base/component_export.h"
 
+#ifndef MAS_BUILD
 // The CGSConnectionID is used to create the CAContext in the process that is
 // going to share the CALayers that it is rendering to another process to
 // display.
@@ -50,6 +51,8 @@ typedef uint32_t CAContextID;
 
 #endif // __OBJC__
 
+#endif // MAS_BUILD
+
 namespace ui {
 
 // This function will check if all of the interfaces listed above are supported
diff --git a/ui/base/cocoa/remote_layer_api.mm b/ui/base/cocoa/remote_layer_api.mm
index bbaf9f466f4999acb5bfccf3b9565fd8f556ca2f..8c846ce9523a4b2f6fbdbdbeae4f94b45ac3c115 100644
--- a/ui/base/cocoa/remote_layer_api.mm
+++ b/ui/base/cocoa/remote_layer_api.mm
@@ -12,6 +12,7 @@
 namespace ui {
 
 bool RemoteLayerAPISupported() {
+#ifndef MAS_BUILD
   static bool disabled_at_command_line =
       base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kDisableRemoteCoreAnimation);
@@ -46,6 +47,9 @@ bool RemoteLayerAPISupported() {
 
   // If everything is there, we should be able to use the API.
   return true;
+#else
+  return false;
+#endif  // MAS_BUILD
 }
 
 }  // namespace