Remove renderer-side tracking of accelerated compositing

Remove didActivate/didDeactivateCompositor from everywhere that calls it
as it now does nothing.

BUG=none

Review URL: https://codereview.chromium.org/288633002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271234 0039d316-1c4b-4281-b951-d872f2087c98

content/renderer/render_view_impl.cc

@@ -1938,8 +1938,6 @@ void RenderViewImpl::didActivateCompositor() {
         AsWeakPtr());
   }
 #endif
-
-  RenderWidget::didActivateCompositor();
 }
 
 void RenderViewImpl::didHandleGestureEvent(

content/renderer/render_widget.cc

@@ -383,7 +383,6 @@ RenderWidget::RenderWidget(blink::WebPopupType popup_type,
       popup_type_(popup_type),
       pending_window_rect_count_(0),
       suppress_next_char_events_(false),
-      is_accelerated_compositing_active_(false),
       screen_info_(screen_info),
       device_scale_factor_(screen_info_.deviceScaleFactor),
       is_threaded_compositing_enabled_(false),
@@ -486,11 +485,8 @@ void RenderWidget::CompleteInit() {
 
   init_complete_ = true;
 
-  if (webwidget_) {
-    if (is_threaded_compositing_enabled_ || ForceCompositingModeEnabled()) {
+  if (webwidget_)
     webwidget_->enterForceCompositingMode(true);
-    }
-  }
   if (compositor_)
     StartCompositor();
 
@@ -784,13 +780,9 @@ void RenderWidget::OnWasShown(bool needs_repainting) {
     return;
 
   // Generate a full repaint.
-  if (!is_accelerated_compositing_active_) {
-    didInvalidateRect(gfx::Rect(size_.width(), size_.height()));
-  } else {
   if (compositor_)
     compositor_->SetNeedsForcedRedraw();
   scheduleComposite();
-  }
 }
 
 void RenderWidget::OnWasSwappedOut() {
@@ -1172,19 +1164,6 @@ void RenderWidget::AutoResizeCompositor()  {
     compositor_->setViewportSize(size_, physical_backing_size_);
 }
 
-void RenderWidget::didActivateCompositor() {
-  TRACE_EVENT0("gpu", "RenderWidget::didActivateCompositor");
-
-  is_accelerated_compositing_active_ = true;
-  webwidget_->enterForceCompositingMode(true);
-}
-
-void RenderWidget::didDeactivateCompositor() {
-  TRACE_EVENT0("gpu", "RenderWidget::didDeactivateCompositor");
-
-  is_accelerated_compositing_active_ = false;
-}
-
 void RenderWidget::initializeLayerTreeView() {
   compositor_ = RenderWidgetCompositor::Create(
       this, is_threaded_compositing_enabled_);
@@ -1485,12 +1464,8 @@ void RenderWidget::OnRepaint(gfx::Size size_to_paint) {
   }
 
   set_next_paint_is_repaint_ack();
-  if (is_accelerated_compositing_active_ && compositor_) {
+  if (compositor_)
     compositor_->SetNeedsRedrawRect(gfx::Rect(size_to_paint));
-  } else {
-    gfx::Rect repaint_rect(size_to_paint.width(), size_to_paint.height());
-    didInvalidateRect(repaint_rect);
-  }
 }
 
 void RenderWidget::OnSyntheticGestureCompleted() {
@@ -1546,12 +1521,7 @@ void RenderWidget::SetDeviceScaleFactor(float device_scale_factor) {
     return;
 
   device_scale_factor_ = device_scale_factor;
-
-  if (!is_accelerated_compositing_active_) {
-    didInvalidateRect(gfx::Rect(size_.width(), size_.height()));
-  } else {
   scheduleComposite();
-  }
 }
 
 void RenderWidget::OnOrientationChange() {

content/renderer/render_widget.h

@@ -122,8 +122,6 @@ class CONTENT_EXPORT RenderWidget
   virtual void suppressCompositorScheduling(bool enable);
   virtual void willBeginCompositorFrame();
   virtual void didAutoResize(const blink::WebSize& new_size);
-  virtual void didActivateCompositor() OVERRIDE;
-  virtual void didDeactivateCompositor();
   virtual void initializeLayerTreeView();
   virtual blink::WebLayerTreeView* layerTreeView();
   virtual void didBecomeReadyForAdditionalInput();
@@ -641,10 +639,6 @@ class CONTENT_EXPORT RenderWidget
   // Indicates if the next sequence of Char events should be suppressed or not.
   bool suppress_next_char_events_;
 
-  // Set to true if painting to the window is handled by the accelerated
-  // compositor.
-  bool is_accelerated_compositing_active_;
-
   // Properties of the screen hosting this RenderWidget instance.
   blink::WebScreenInfo screen_info_;
 

content/renderer/render_widget_fullscreen_pepper.cc

@@ -324,22 +324,16 @@ void RenderWidgetFullscreenPepper::DidChangeCursor(
 
 void RenderWidgetFullscreenPepper::SetLayer(blink::WebLayer* layer) {
   layer_ = layer;
-  bool compositing = !!layer_;
-  if (compositing != is_accelerated_compositing_active_) {
-    if (compositing) {
+  if (!layer_) {
+    compositor_->clearRootLayer();
+    return;
+  }
   if (!layerTreeView())
     initializeLayerTreeView();
-      if (!layerTreeView())
-        return;
   layer_->setBounds(blink::WebSize(size()));
   layer_->setDrawsContent(true);
   compositor_->setDeviceScaleFactor(device_scale_factor_);
   compositor_->setRootLayer(*layer_);
-      didActivateCompositor();
-    } else {
-      didDeactivateCompositor();
-    }
-  }
 }
 
 bool RenderWidgetFullscreenPepper::OnMessageReceived(const IPC::Message& msg) {