Support plumbing LatencyInfo through the old software path.

content/browser/renderer_host/render_widget_host_view_aura.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_widget_host_view_aura.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 1010 matching lines @@
 
 void RenderWidgetHostViewAura::ImeCompositionRangeChanged(
     const ui::Range& range,
     const std::vector<gfx::Rect>& character_bounds) {
   composition_character_bounds_ = character_bounds;
 }
 
 void RenderWidgetHostViewAura::DidUpdateBackingStore(
     const gfx::Rect& scroll_rect,
     const gfx::Vector2d& scroll_delta,
-    const std::vector<gfx::Rect>& copy_rects) {
+    const std::vector<gfx::Rect>& copy_rects,
+    const ui::LatencyInfo& latency_info) {
   if (accelerated_compositing_state_changed_)
     UpdateExternalTexture();
 
+  software_latency_info_.MergeWith(latency_info);

[piman, 2013/06/07 02:51:30]

Does this grow arbitrarily? If the tab is updating while offscreen, I'm afraid
we won't be calling OnPaint. Can this be a problem?

[jbauman, 2013/06/07 07:28:24]

No, this structure was designed not to grow, for this very reason.

+
   // Use the state of the RenderWidgetHost and not the window as the two may
   // differ. In particular if the window is hidden but the renderer isn't and we
   // ignore the update and the window is made visible again the layer isn't
   // marked as dirty and we show the wrong thing.
   // We do this after UpdateExternalTexture() so that when we become visible
   // we're not drawing a stale texture.
   if (host_->is_hidden())
     return;
 
   gfx::Rect clip_rect;
@@ skipping 1178 matching lines @@
       paint_observer_->OnPaintComplete();
   } else if (!is_compositing_active && has_backing_store) {
     paint_canvas_ = canvas;
     BackingStoreAura* backing_store = static_cast<BackingStoreAura*>(
         host_->GetBackingStore(true));
     paint_canvas_ = NULL;
     backing_store->SkiaShowRect(gfx::Point(), canvas);
 
     if (paint_observer_)
       paint_observer_->OnPaintComplete();
+    ui::Compositor* compositor = GetCompositor();
+    if (compositor) {
+      compositor->SetLatencyInfo(software_latency_info_);
+      software_latency_info_.Clear();
+    }
   } else if (aura::Env::GetInstance()->render_white_bg()) {
     canvas->DrawColor(SK_ColorWHITE);
   }
 }
 
 void RenderWidgetHostViewAura::OnDeviceScaleFactorChanged(
     float device_scale_factor) {
   if (!host_)
     return;
 
@@ skipping 786 matching lines @@
     RenderWidgetHost* widget) {
   return new RenderWidgetHostViewAura(widget);
 }
 
 // static
 void RenderWidgetHostViewPort::GetDefaultScreenInfo(WebScreenInfo* results) {
   GetScreenInfoForWindow(results, NULL);
 }
 
 }  // namespace content