Adding a chrome flag to control the touch selection granularity strategy used by Blink.

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index 85116e67b2877770360ec2b4101ad8dc663e85b4..0d5ffd93c59c57bd897d83760460ce6c61c713a2 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -763,6 +763,14 @@ void RenderViewImpl::Initialize(const ViewMsg_New_Params& params,
   if (switches::IsTouchEditingEnabled())
     webview()->settings()->setTouchEditingEnabled(true);
 
+  const std::string selection_strategy_str =
+      base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
+          switches::kTouchTextSelectionStrategy);
+  if (selection_strategy_str == "1") {
+    webview()->settings()->setSelectionStrategy(
+        WebSettings::StrategyDirection);
+  }
+
   if (!params.frame_name.empty())
     webview()->mainFrame()->setName(params.frame_name);