Expose the capturePicture feature in RenderView for Android WebView legacy API support.

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 7fae491a39916ccfe2538dbf65788f4c8e4aa258..51f2dbbad9f3b328ac129ddddefab38fcdc1751a 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -1371,6 +1371,9 @@ void RenderWidget::didBecomeReadyForAdditionalInput() {
     Send(pending_input_event_ack_.release());
 }
 
+void RenderWidget::DidCommitCompositorFrame() {
+}
+
 void RenderWidget::didCommitAndDrawCompositorFrame() {
   TRACE_EVENT0("gpu", "RenderWidget::didCommitAndDrawCompositorFrame");
   // Accelerated FPS tick for performance tests. See throughput_tests.cc.