Adds kind-of-live thumbnail generation for a potential tab switcher.

This listens to tab events and tries to keep thumbnails ready to go. See
thumbnail_generator.cc for a more detailed design.

This adds a painting observer to the RenderWidgetHost to enable this new
behavior, as well as a notification to allow the thumbnail generator to hook
its observer in. There is also a new notification that a backing store has been
disabled, which required making the backing stores know about their owning
widget hosts.

This component is currently disabled. We just need to uncomment the member in
Profile and it will start to work.

Original review: http://codereview.chromium.org/118420

Review URL: http://codereview.chromium.org/126101

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@18540 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 1 insertions, 17 deletions

diff --git a/chrome/renderer/DEPS b/chrome/renderer/DEPS
index cb1f386..d5673d2 100644..100755
--- a/chrome/renderer/DEPS
+++ b/chrome/renderer/DEPS
@@ -6,7 +6,6 @@ include_rules = [
   "+media/base",
   "+media/filters",
   "+sandbox/src",
-  "+skia/ext",
   "+skia/include",
   "+webkit/default_plugin",
   "+webkit/extensions",
diff --git a/chrome/renderer/render_process.cc b/chrome/renderer/render_process.cc
index 6cfb56d..027b209 100644
--- a/chrome/renderer/render_process.cc
+++ b/chrome/renderer/render_process.cc
@@ -136,21 +136,6 @@ bool RenderProcess::InProcessPlugins() {
 // -----------------------------------------------------------------------------
 // Platform specific code for dealing with bitmap transport...
 
-// -----------------------------------------------------------------------------
-// Create a platform canvas object which renders into the given transport
-// memory.
-// -----------------------------------------------------------------------------
-static skia::PlatformCanvas* CanvasFromTransportDIB(
-    TransportDIB* dib, const gfx::Rect& rect) {
-#if defined(OS_WIN)
-  return new skia::PlatformCanvas(rect.width(), rect.height(), true,
-                                  dib->handle());
-#elif defined(OS_LINUX) || defined(OS_MACOSX)
-  return new skia::PlatformCanvas(rect.width(), rect.height(), true,
-                                  reinterpret_cast<uint8_t*>(dib->memory()));
-#endif
-}
-
 TransportDIB* RenderProcess::CreateTransportDIB(size_t size) {
 #if defined(OS_WIN) || defined(OS_LINUX)
   // Windows and Linux create transport DIBs inside the renderer
@@ -196,7 +181,7 @@ skia::PlatformCanvas* RenderProcess::GetDrawingCanvas(
       return false;
   }
 
-  return CanvasFromTransportDIB(*memory, rect);
+  return (*memory)->GetPlatformCanvas(rect.width(), rect.height());
 }
 
 void RenderProcess::ReleaseTransportDIB(TransportDIB* mem) {