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# Description: Allow the embedder to override the renderer compositor
# settings
# Author: Chris Coulson <chris.coulson@canonical.com>
diff --git a/content/public/renderer/content_renderer_client.cc b/content/public/renderer/content_renderer_client.cc
--- a/content/public/renderer/content_renderer_client.cc
+++ b/content/public/renderer/content_renderer_client.cc
@@ -219,9 +219,12 @@ ContentRendererClient::CreateAppBannerCl
blink::WebMediaPlayer* ContentRendererClient::OverrideWebMediaPlayer(
blink::WebFrame* frame,
blink::WebMediaPlayerClient* client,
base::WeakPtr<media::WebMediaPlayerDelegate> delegate,
media::MediaLog* media_log) {
return nullptr;
}
+void ContentRendererClient::OverrideCompositorSettings(
+ cc::LayerTreeSettings* settings) {}
+
} // namespace content
diff --git a/content/public/renderer/content_renderer_client.h b/content/public/renderer/content_renderer_client.h
--- a/content/public/renderer/content_renderer_client.h
+++ b/content/public/renderer/content_renderer_client.h
@@ -50,16 +50,20 @@ class WebSpeechSynthesizerClient;
class WebThemeEngine;
class WebURLResponse;
class WebURLRequest;
class WebWorkerContentSettingsClientProxy;
struct WebPluginParams;
struct WebURLError;
}
+namespace cc {
+class LayerTreeSettings;
+}
+
namespace media {
class GpuVideoAcceleratorFactories;
class MediaLog;
class RendererFactory;
class WebMediaPlayerDelegate;
struct KeySystemInfo;
}
@@ -314,13 +318,16 @@ class CONTENT_EXPORT ContentRendererClie
virtual void WillDestroyServiceWorkerContextOnWorkerThread(const GURL& url) {}
// Allow overriding default media player
virtual blink::WebMediaPlayer* OverrideWebMediaPlayer(
blink::WebFrame* frame,
blink::WebMediaPlayerClient* client,
base::WeakPtr<media::WebMediaPlayerDelegate> delegate,
media::MediaLog* media_log);
+
+ // Allow overriding the renderer compositor settings
+ virtual void OverrideCompositorSettings(cc::LayerTreeSettings* settings);
};
} // namespace content
#endif // CONTENT_PUBLIC_RENDERER_CONTENT_RENDERER_CLIENT_H_
diff --git a/content/renderer/gpu/render_widget_compositor.cc b/content/renderer/gpu/render_widget_compositor.cc
--- a/content/renderer/gpu/render_widget_compositor.cc
+++ b/content/renderer/gpu/render_widget_compositor.cc
@@ -34,17 +34,19 @@
#include "cc/output/swap_promise.h"
#include "cc/resources/single_release_callback.h"
#include "cc/scheduler/begin_frame_source.h"
#include "cc/trees/latency_info_swap_promise_monitor.h"
#include "cc/trees/layer_tree_host.h"
#include "components/scheduler/renderer/renderer_scheduler.h"
#include "content/common/content_switches_internal.h"
#include "content/common/gpu/client/context_provider_command_buffer.h"
+#include "content/public/common/content_client.h"
#include "content/public/common/content_switches.h"
+#include "content/public/renderer/content_renderer_client.h"
#include "content/renderer/input/input_handler_manager.h"
#include "gpu/command_buffer/client/gles2_interface.h"
#include "third_party/WebKit/public/platform/WebCompositeAndReadbackAsyncCallback.h"
#include "third_party/WebKit/public/platform/WebLayoutAndPaintAsyncCallback.h"
#include "third_party/WebKit/public/platform/WebSize.h"
#include "third_party/WebKit/public/web/WebKit.h"
#include "third_party/WebKit/public/web/WebRuntimeFeatures.h"
#include "third_party/WebKit/public/web/WebSelection.h"
@@ -475,16 +477,18 @@ void RenderWidgetCompositor::Initialize(
settings.use_external_begin_frame_source = false;
}
settings.max_staging_buffers = 32;
// Use 1/4th of staging buffers on low-end devices.
if (base::SysInfo::IsLowEndDevice())
settings.max_staging_buffers /= 4;
+ GetContentClient()->renderer()->OverrideCompositorSettings(&settings);
+
scoped_refptr<base::SingleThreadTaskRunner> compositor_thread_task_runner =
compositor_deps_->GetCompositorImplThreadTaskRunner();
scoped_refptr<base::SingleThreadTaskRunner>
main_thread_compositor_task_runner =
compositor_deps_->GetCompositorMainThreadTaskRunner();
cc::SharedBitmapManager* shared_bitmap_manager =
compositor_deps_->GetSharedBitmapManager();
gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager =
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