SkiaOutputDeviceGL estimates GPU memory for GLSurface

SkiatOutputDeviceGL allocates gl_surface_ that contains swapchain
images. Creation is abstract thus gpu memory consumption can only be
estimated.

Bug: 899905
Change-Id: Id2834a4b6cb34a6a4f8827ad0452cf7c93219600
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2037950Reviewed-by: Peng Huang <penghuang@chromium.org>
Commit-Queue: Kramer Ge <fangzhoug@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739002}

components/viz/service/display_embedder/skia_output_device_gl.cc

@@ -91,7 +91,10 @@ SkiaOutputDeviceGL::SkiaOutputDeviceGL(
   supports_alpha_ = alpha_bits > 0;
 }
 
-SkiaOutputDeviceGL::~SkiaOutputDeviceGL() = default;
+SkiaOutputDeviceGL::~SkiaOutputDeviceGL() {
+  // gl_surface_ will be destructed soon.
+  memory_type_tracker_->TrackMemFree(backbuffer_estimated_size_);
+}
 
 bool SkiaOutputDeviceGL::Reshape(const gfx::Size& size,
                                  float device_scale_factor,
@@ -139,6 +142,19 @@ bool SkiaOutputDeviceGL::Reshape(const gfx::Size& size,
                << framebuffer_info.fFormat << " " << color_space.ToString()
                << " " << size.ToString();
   }
+
+  memory_type_tracker_->TrackMemFree(backbuffer_estimated_size_);
+  GLenum format = gpu::gles2::TextureManager::ExtractFormatFromStorageFormat(
+      framebuffer_info.fFormat);
+  GLenum type = gpu::gles2::TextureManager::ExtractTypeFromStorageFormat(
+      framebuffer_info.fFormat);
+  uint32_t estimated_size;
+  gpu::gles2::GLES2Util::ComputeImageDataSizes(
+      size.width(), size.height(), 1 /* depth */, format, type,
+      4 /* alignment */, &estimated_size, nullptr, nullptr);
+  backbuffer_estimated_size_ = estimated_size * gl_surface_->GetBufferCount();
+  memory_type_tracker_->TrackMemAlloc(backbuffer_estimated_size_);
+
   return !!sk_surface_;
 }
 

components/viz/service/display_embedder/skia_output_device_gl.h

@@ -93,6 +93,7 @@ class SkiaOutputDeviceGL final : public SkiaOutputDevice {
   sk_sp<SkSurface> sk_surface_;
 
   bool supports_alpha_ = false;
+  uint64_t backbuffer_estimated_size_ = 0;
 
   base::WeakPtrFactory<SkiaOutputDeviceGL> weak_ptr_factory_{this};