Resize DevTools target frames.

content/browser/devtools/protocol/emulation_handler.cc

Index: content/browser/devtools/protocol/emulation_handler.cc
diff --git a/content/browser/devtools/protocol/emulation_handler.cc b/content/browser/devtools/protocol/emulation_handler.cc
index aa0d798a4336d7408220b2a0aff252774ae86c21..269fc622f5f88f236f8de2bfae5ecd3e37d0f86c 100644
--- a/content/browser/devtools/protocol/emulation_handler.cc
+++ b/content/browser/devtools/protocol/emulation_handler.cc
@@ -245,6 +245,20 @@ Response EmulationHandler::ClearDeviceMetricsOverride() {
   return Response::OK();
 }
 
+Response EmulationHandler::SetVisibleSize(int width, int height) {
+  if (width < 0 || height < 0)
+    return Response::InvalidParams("Width and height must be non-negative");
+
+  // Set size of frame by resizing RWHV if available.
+  RenderWidgetHostImpl* widget_host =
+      host_ ? host_->GetRenderWidgetHost() : nullptr;
+  if (!widget_host)
+    return Response::ServerError("Target does not support setVisibleSize");
+
+  widget_host->GetView()->SetSize(gfx::Size(width, height));
+  return Response::OK();
+}
+
 WebContentsImpl* EmulationHandler::GetWebContents() {
   return host_ ?
       static_cast<WebContentsImpl*>(WebContents::FromRenderFrameHost(host_)) :