[Experimental, WIP] Demo version of extracting WebView selection data from CompositorFrame.

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index 5483d015acf38f59223043d66ba7284904ddb031..d454473858541f61e10a9c2c762533f192ae00aa 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -1170,6 +1170,18 @@ void RenderWidgetHostViewAura::OnSwapCompositorFrame(
     scoped_ptr<cc::CompositorFrame> frame) {
   TRACE_EVENT0("content", "RenderWidgetHostViewAura::OnSwapCompositorFrame");
 
+  if (!focused_node_is_plugin()) {
+    cc::ViewportSelectionBound start = frame->metadata.selection.start;
+    fprintf(stderr, "wjm: RWHVA::OnSwapCompositorFrame(%p) Window "
+            "edge_top=(%6.1f,%6.1f) edge_bottom=(%6.1f,%6.1f)\n",
+            this, start.edge_top.x(), start.edge_top.y(),
+            start.edge_bottom.x(), start.edge_bottom.y());
+  } else {
+    // This is just to demonstrate when RWHVA *shouldn't* send selection info.
+    fprintf(stderr, "wjm: RWHVA::OnSwapCompositorFrame(%p) - not focused\n",
+            this);
+  }
+
   last_scroll_offset_ = frame->metadata.root_scroll_offset;
   if (frame->delegated_frame_data) {
     delegated_frame_host_->SwapDelegatedFrame(