OOPIF: Send page-level focus messages to all processes rendering a page.

content/browser/frame_host/frame_tree.cc

Index: content/browser/frame_host/frame_tree.cc
diff --git a/content/browser/frame_host/frame_tree.cc b/content/browser/frame_host/frame_tree.cc
index 742b84782e2c6d9aa162283123632f97480b0815..ac61afa5240b7d354ad2e4f6b558483f6fb19930 100644
--- a/content/browser/frame_host/frame_tree.cc
+++ b/content/browser/frame_host/frame_tree.cc
@@ -18,6 +18,7 @@
 #include "content/browser/frame_host/render_frame_proxy_host.h"
 #include "content/browser/renderer_host/render_view_host_factory.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
+#include "content/common/input_messages.h"
 #include "content/common/site_isolation_policy.h"
 #include "third_party/WebKit/public/web/WebSandboxFlags.h"
 
@@ -94,6 +95,14 @@ bool IsNodeLoading(bool* is_loading, FrameTreeNode* node) {
   return true;
 }
 
+// Helper function used with FrameTree::ForEach to collect SiteInstances
+// involved in rendering a single FrameTree (which is a subset of SiteInstances
+// in main frame's proxy_hosts_ because of openers).
+bool CollectSiteInstances(std::set<SiteInstance*>* set, FrameTreeNode* node) {
+  set->insert(node->current_frame_host()->GetSiteInstance());
+  return true;
+}
+
 }  // namespace
 
 FrameTree::FrameTree(Navigator* navigator,
@@ -411,4 +420,23 @@ bool FrameTree::IsLoading() {
   return is_loading;
 }
 
+void FrameTree::ReplicatePageFocus(bool is_focused) {
+  std::set<SiteInstance*> frame_tree_site_instances;
+  ForEach(base::Bind(&CollectSiteInstances, &frame_tree_site_instances));
+
+  // Send the focus update to main frame's proxies in all SiteInstances of
+  // other frames in this FrameTree. Note that the main frame might also know
+  // about proxies in SiteInstances for frames in a different FrameTree (e.g.,
+  // for window.open), so we can't just iterate over its proxy_hosts_ in
+  // RenderFrameHostManager.
+  for (const auto& instance : frame_tree_site_instances) {
+    if (instance == root_->current_frame_host()->GetSiteInstance())
+      continue;
+
+    RenderFrameProxyHost* proxy =
+        root_->render_manager()->GetRenderFrameProxyHost(instance);
+    proxy->Send(new InputMsg_SetFocus(proxy->GetRoutingID(), is_focused));
+  }
+}
+
 }  // namespace content