Expose a low-end device mode override flags for non-android OSs as well

content/renderer/render_widget.cc

Index: content/renderer/render_widget.cc
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index 852e94e1c8b4f396f31692c1ee66f72f20195141..5af3bb0b0a3e0f65550e425ccc66dd0efe7ca0ac 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -14,6 +14,7 @@
 #include "base/metrics/histogram.h"
 #include "base/stl_util.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/sys_utils.h"
 #include "build/build_config.h"
 #include "cc/base/switches.h"
 #include "cc/debug/benchmark_instrumentation.h"
@@ -67,7 +68,6 @@
 #include "webkit/renderer/compositor_bindings/web_rendering_stats_impl.h"
 
 #if defined(OS_ANDROID)
-#include "base/android/sys_utils.h"
 #include "content/renderer/android/synchronous_compositor_factory.h"
 #endif
 
@@ -932,10 +932,8 @@ scoped_ptr<cc::OutputSurface> RenderWidget::CreateOutputSurface(bool fallback) {
   if (command_line.HasSwitch(cc::switches::kCompositeToMailbox)) {
     DCHECK(is_threaded_compositing_enabled_);
     cc::ResourceFormat format = cc::RGBA_8888;
-#if defined(OS_ANDROID)
-    if (base::android::SysUtils::IsLowEndDevice())
+    if (base::SysUtils::IsLowEndDevice())
       format = cc::RGB_565;
-#endif
     return scoped_ptr<cc::OutputSurface>(
         new MailboxOutputSurface(
             routing_id(),
@@ -2834,14 +2832,14 @@ RenderWidget::CreateGraphicsContext3D(
     return scoped_ptr<WebGraphicsContext3DCommandBufferImpl>();
 
   WebGraphicsContext3DCommandBufferImpl::SharedMemoryLimits limits;
-#if defined(OS_ANDROID)
+
   // If we raster too fast we become upload bound, and pending
   // uploads consume memory. For maximum upload throughput, we would
   // want to allow for upload_throughput * pipeline_time of pending
   // uploads, after which we are just wasting memory. Since we don't
   // know our upload throughput yet, this just caps our memory usage.
   size_t divider = 1;
-  if (base::android::SysUtils::IsLowEndDevice())
+  if (base::SysUtils::IsLowEndDevice())
     divider = 6;
   // For reference Nexus10 can upload 1MB in about 2.5ms.
   const double max_mb_uploaded_per_ms = 2.0 / (5 * divider);
@@ -2855,7 +2853,6 @@ RenderWidget::CreateGraphicsContext3D(
   // to avoid unnecessarily stalling the compositor thread.
   limits.mapped_memory_reclaim_limit =
       max_transfer_buffer_usage_mb * kBytesPerMegabyte;

[piman, 2014/01/08 04:41:50]

This changes behavior for non-low-end devices too. (previously we were using the
defaults for mapped_memory_reclaim_limit).

[ostap, 2014/01/20 08:12:24]

Done.

-#endif
 
   scoped_ptr<WebGraphicsContext3DCommandBufferImpl> context(
       new WebGraphicsContext3DCommandBufferImpl(