Disable window occlusion APIs when running browser tests

content/public/common/content_switches.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 "build/build_config.h"
 #include "content/public/common/content_switches.h"
 
 namespace switches {
 
 // The number of MSAA samples for canvas2D. Requires MSAA support by GPU to
@@ skipping 72 matching lines @@
     "disable-accelerated-mjpeg-decode";
 
 // Disables hardware acceleration of video decode, where available.
 const char kDisableAcceleratedVideoDecode[] =
     "disable-accelerated-video-decode";
 
 // Disable limits on the number of backing stores. Can prevent blinking for
 // users with many windows/tabs and lots of memory.
 const char kDisableBackingStoreLimit[]      = "disable-backing-store-limit";
 
+// Disable backgrounding renders for occluded windows. Done for tests to avoid
+// nondeterministic behavior.
+extern const char kDisableBackgroundingOccludedWindowsForTesting[] =
+    "disable-backgrounding-occluded-windows";
+
 // Disable one or more Blink runtime-enabled features.
 // Use names from RuntimeEnabledFeatures.in, separated by commas.
 // Applied after kEnableBlinkFeatures, and after other flags that change these
 // features.
 const char kDisableBlinkFeatures[]          = "disable-blink-features";
 
 // Disables HTML5 DB support.
 const char kDisableDatabases[]              = "disable-databases";
 
 // Disables Delay Agnostic AEC in WebRTC.
@@ skipping 937 matching lines @@
 const char kMemoryPressureThresholdsMb[] = "memory-pressure-thresholds-mb";
 
 // Enables the exporting of the tracing events to ETW. This is only supported on
 // Windows Vista and later.
 const char kTraceExportEventsToETW[] = "trace-export-events-to-etw";
 #endif
 
 // Don't dump stuff here, follow the same order as the header.
 
 }  // namespace switches