Unit Test for WebView animating in and out of screen

android_webview/browser/browser_view_renderer.cc

 // Copyright 2014 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 "android_webview/browser/browser_view_renderer.h"
 
 #include "android_webview/browser/browser_view_renderer_client.h"
 #include "base/auto_reset.h"
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 198 matching lines @@
   if (!hardware_enabled_) {
     TRACE_EVENT0("android_webview", "InitializeHwDraw");
     hardware_enabled_ = compositor_->InitializeHwDraw();
   }
   if (!hardware_enabled_) {
     TRACE_EVENT_INSTANT0("android_webview", "EarlyOut_HardwareNotEnabled",
                          TRACE_EVENT_SCOPE_THREAD);
     return false;
   }
 
+  if (last_on_draw_global_visible_rect_.IsEmpty()) {
+    // WebView could be offscreen. Need to make sure WebView invalidates when
+    // it is animated into the screen again.
+    shared_renderer_state_.SetForceInvalidateOnNextDrawGLOnUI(true);
+  }
+
   ReturnResourceFromParent();
   if (shared_renderer_state_.HasCompositorFrameOnUI()) {
     TRACE_EVENT_INSTANT0("android_webview",
                          "EarlyOut_PreviousFrameUnconsumed",
                          TRACE_EVENT_SCOPE_THREAD);
     DidSkipCompositeInDraw();
     return true;
   }
 
   scoped_ptr<cc::CompositorFrame> frame = CompositeHw();
@@ skipping 26 matching lines @@
   // Leave viewport_rect_for_tile_priority empty if offscreen_pre_raster_ is on.
   if (!offscreen_pre_raster_) {
     if (parent_draw_constraints_.is_layer ||
         last_on_draw_global_visible_rect_.IsEmpty()) {
       viewport_rect_for_tile_priority = parent_draw_constraints_.surface_rect;
     } else {
       viewport_rect_for_tile_priority = last_on_draw_global_visible_rect_;
     }
   }
 
-  scoped_ptr<cc::CompositorFrame> frame =
-      compositor_->DemandDrawHw(surface_size,
-                                gfx::Transform(),
-                                viewport,
-                                clip,
-                                viewport_rect_for_tile_priority,
-                                transform_for_tile_priority);
+  scoped_ptr<cc::CompositorFrame> frame = compositor_->DemandDrawHw(
+      surface_size, gfx::Transform(), viewport, clip,
+      viewport_rect_for_tile_priority, transform_for_tile_priority);
   if (frame.get())
     DidComposite();
   return frame.Pass();
 }
 
 void BrowserViewRenderer::UpdateParentDrawConstraints() {
   // Post an invalidate if the parent draw constraints are stale and there is
   // no pending invalidate.
   bool needs_force_invalidate =
       shared_renderer_state_.NeedsForceInvalidateOnNextDrawGLOnUI();
@@ skipping 502 matching lines @@
   base::StringAppendF(&str,
                       "overscroll_rounding_error_: %s ",
                       overscroll_rounding_error_.ToString().c_str());
   base::StringAppendF(
       &str, "on_new_picture_enable: %d ", on_new_picture_enable_);
   base::StringAppendF(&str, "clear_view: %d ", clear_view_);
   return str;
 }
 
 }  // namespace android_webview