content: Partial copy workaround for devices with known upload performance problems.

content/renderer/gpu/render_widget_compositor.cc

Index: content/renderer/gpu/render_widget_compositor.cc
diff --git a/content/renderer/gpu/render_widget_compositor.cc b/content/renderer/gpu/render_widget_compositor.cc
index a43c92056d26a06d43143ba8e2af2c4c9c7e0c86..4cca5041281593342a7d5cc06e0563eaa343e6bc 100644
--- a/content/renderer/gpu/render_widget_compositor.cc
+++ b/content/renderer/gpu/render_widget_compositor.cc
@@ -50,6 +50,7 @@
 #include "ui/native_theme/native_theme_switches.h"
 
 #if defined(OS_ANDROID)
+#include "base/android/build_info.h"
 #include "content/renderer/android/synchronous_compositor_factory.h"
 #include "ui/gfx/android/device_display_info.h"
 #endif
@@ -178,14 +179,6 @@ gfx::Size CalculateDefaultTileSize(RenderWidget* widget) {
   return gfx::Size(default_tile_size, default_tile_size);
 }
 
-int GetMaxBytesPerCopyOperation() {
-  const int kMegabyte = 1024 * 1024;
-
-  // 4MiB is the size of 4 512x512 tiles, which has proven to be a good
-  // default batch size for copy operations.
-  return kMegabyte * 4;
-}
-
 // Check cc::TopControlsState, and blink::WebTopControlsState
 // are kept in sync.
 static_assert(int(blink::WebTopControlsBoth) == int(cc::BOTH),
@@ -467,8 +460,6 @@ void RenderWidgetCompositor::Initialize() {
     settings.use_external_begin_frame_source = false;
   }
 
-  settings.max_bytes_per_copy_operation = GetMaxBytesPerCopyOperation();
-
   scoped_refptr<base::SingleThreadTaskRunner> compositor_thread_task_runner =
       compositor_deps_->GetCompositorImplThreadTaskRunner();
   scoped_refptr<base::SingleThreadTaskRunner>