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.patch

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.mm b/gpu/ipc/service/image_transport_surface_overlay_mac.mm
index c1af03a268dc..b883883ad52b 100644
--- a/gpu/ipc/service/image_transport_surface_overlay_mac.mm
+++ b/gpu/ipc/service/image_transport_surface_overlay_mac.mm
@@ -63,6 +63,7 @@
 template <typename BaseClass>
 bool ImageTransportSurfaceOverlayMacBase<BaseClass>::Initialize(
     gl::GLSurfaceFormat format) {
+#ifndef MAS_BUILD
   // Create the CAContext to send this to the GPU process, and the layer for
   // the context.
   if (use_remote_layer_api_) {
@@ -71,6 +72,7 @@
         [CAContext contextWithCGSConnection:connection_id options:@{}] retain]);
     [ca_context_ setLayer:ca_layer_tree_coordinator_->GetCALayerForDisplay()];
   }
+#endif
   return true;
 }
 
@@ -139,7 +141,9 @@
                          "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/gpu/ipc/service/image_transport_surface_overlay_mac.h b/gpu/ipc/service/image_transport_surface_overlay_mac.h
index f65ad035e90c..9edb62e713e8 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 {
@@ -97,7 +99,9 @@ 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/ui/accelerated_widget_mac/display_ca_layer_tree.mm b/ui/accelerated_widget_mac/display_ca_layer_tree.mm
index 60abe639bd9c..c38eed5fbdef 100644
--- a/ui/accelerated_widget_mac/display_ca_layer_tree.mm
+++ b/ui/accelerated_widget_mac/display_ca_layer_tree.mm
@@ -98,6 +98,7 @@ - (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;
@@ -122,6 +123,9 @@ - (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 2057fe69d1bb..2aba330fc488 100644
--- a/ui/base/cocoa/remote_layer_api.h
+++ b/ui/base/cocoa/remote_layer_api.h
@@ -13,6 +13,7 @@
 
 #include "ui/base/ui_base_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 bbaf9f466f49..8c846ce9523a 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