cc: Add initial GPU-to-GPU copy rasterizer implementation.

This adds a derived RasterWorkerPool class that use a smaller
resource pool for staging and initialize tile resources by
copying the contents of a staging resource to a tile resource
using CHROMIUM_copy_texture.

Zero-copy is still used by default when map-image rasterizer
is enabled using --enable-map-image. GPU-to-GPU copy
rasterizer is used when --disable-zero-copy switch is
provided in combination with --enable-map-image. This
zero-copy setting is also added to about:flags.

BUG=269808
TBR=sky

Review URL: https://codereview.chromium.org/236313006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@267455 0039d316-1c4b-4281-b951-d872f2087c98

3 files changed, 6 insertions, 6 deletions

diff --git a/ui/compositor/compositor.cc b/ui/compositor/compositor.cc
index d9149b6..423f2bf 100644
--- a/ui/compositor/compositor.cc
+++ b/ui/compositor/compositor.cc
@@ -154,7 +154,7 @@ Compositor::Compositor(gfx::AcceleratedWidget widget)
       command_line->HasSwitch(cc::switches::kEnableGpuBenchmarking));
 
   settings.impl_side_painting = IsUIImplSidePaintingEnabled();
-  settings.use_map_image = IsUIMapImageEnabled();
+  settings.use_zero_copy = IsUIZeroCopyEnabled();
 
   base::TimeTicks before_create = base::TimeTicks::Now();
   if (!!g_compositor_thread) {
diff --git a/ui/compositor/compositor_switches.cc b/ui/compositor/compositor_switches.cc
index d63b269..a7ffc14 100644
--- a/ui/compositor/compositor_switches.cc
+++ b/ui/compositor/compositor_switches.cc
@@ -19,7 +19,7 @@ const char kUIDisableThreadedCompositing[] = "ui-disable-threaded-compositing";
 
 const char kUIEnableImplSidePainting[] = "ui-enable-impl-side-painting";
 
-const char kUIEnableMapImage[] = "ui-enable-map-image";
+const char kUIEnableZeroCopy[] = "ui-enable-zero-copy";
 
 const char kUIShowPaintRects[] = "ui-show-paint-rects";
 
@@ -33,10 +33,10 @@ bool IsUIImplSidePaintingEnabled() {
   return command_line.HasSwitch(switches::kUIEnableImplSidePainting);
 }
 
-bool IsUIMapImageEnabled() {
+bool IsUIZeroCopyEnabled() {
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
 
-  return command_line.HasSwitch(switches::kUIEnableMapImage);
+  return command_line.HasSwitch(switches::kUIEnableZeroCopy);
 }
 
 }  // namespace ui
diff --git a/ui/compositor/compositor_switches.h b/ui/compositor/compositor_switches.h
index 6518d4f..d487bdd 100644
--- a/ui/compositor/compositor_switches.h
+++ b/ui/compositor/compositor_switches.h
@@ -13,7 +13,7 @@ COMPOSITOR_EXPORT extern const char kEnableHardwareOverlays[];
 COMPOSITOR_EXPORT extern const char kEnablePixelOutputInTests[];
 COMPOSITOR_EXPORT extern const char kUIDisableThreadedCompositing[];
 COMPOSITOR_EXPORT extern const char kUIEnableImplSidePainting[];
-COMPOSITOR_EXPORT extern const char kUIEnableMapImage[];
+COMPOSITOR_EXPORT extern const char kUIEnableZeroCopy[];
 COMPOSITOR_EXPORT extern const char kUIShowPaintRects[];
 
 }  // namespace switches
@@ -21,7 +21,7 @@ COMPOSITOR_EXPORT extern const char kUIShowPaintRects[];
 namespace ui {
 
 COMPOSITOR_EXPORT bool IsUIImplSidePaintingEnabled();
-COMPOSITOR_EXPORT bool IsUIMapImageEnabled();
+COMPOSITOR_EXPORT bool IsUIZeroCopyEnabled();
 
 }  // namespace ui