[DevTools] Implement DevToolsManager::Observer which notifies about target updates.

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 14cf8a42cbf21eccfb415e69ffb85cac85fb0cd7..945671881b6df2e1ffcd5f9467ecda9b5919f774 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -23,7 +23,7 @@
 #include "content/browser/browser_plugin/browser_plugin_embedder.h"
 #include "content/browser/browser_plugin/browser_plugin_guest.h"
 #include "content/browser/child_process_security_policy_impl.h"
-#include "content/browser/devtools/render_view_devtools_agent_host.h"
+#include "content/browser/devtools/devtools_manager.h"
 #include "content/browser/dom_storage/dom_storage_context_wrapper.h"
 #include "content/browser/dom_storage/session_storage_namespace_impl.h"
 #include "content/browser/download/download_stats.h"
@@ -3553,6 +3553,8 @@ void WebContentsImpl::RenderViewCreated(RenderViewHost* render_view_host) {
   FOR_EACH_OBSERVER(
       WebContentsObserver, observers_, RenderFrameCreated(main_frame));
   SetAccessibilityModeOnFrame(accessibility_mode_, main_frame);
+
+  DevToolsManager::GetInstance()->RenderViewCreated(this, render_view_host);
 }
 
 void WebContentsImpl::RenderViewReady(RenderViewHost* rvh) {