[arc-intents] Adjust link-click detection code.

chrome/browser/chromeos/arc/arc_navigation_throttle.cc

Index: chrome/browser/chromeos/arc/arc_navigation_throttle.cc
diff --git a/chrome/browser/chromeos/arc/arc_navigation_throttle.cc b/chrome/browser/chromeos/arc/arc_navigation_throttle.cc
index 93131e18347c362bde6d5e6e1a02086bee645461..5b528eb93d12599cc376e8293e22d7dfb6751e7f 100644
--- a/chrome/browser/chromeos/arc/arc_navigation_throttle.cc
+++ b/chrome/browser/chromeos/arc/arc_navigation_throttle.cc
@@ -16,6 +16,7 @@
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/navigation_handle.h"
 #include "net/base/registry_controlled_domains/registry_controlled_domain.h"
+#include "ui/base/page_transition_types.h"
 
 namespace arc {
 
@@ -63,8 +64,11 @@ ArcNavigationThrottle::~ArcNavigationThrottle() = default;
 content::NavigationThrottle::ThrottleCheckResult
 ArcNavigationThrottle::WillStartRequest() {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
-  if (!navigation_handle()->HasUserGesture())
+  if (ui::PageTransitionCoreTypeIs(navigation_handle()->GetPageTransition(),
+                                   ui::PAGE_TRANSITION_LINK)) {
+    // If this navigation event wasn't spawned by the user clicking on a link.

[Luis Héctor Chávez, 2016/07/22 15:35:34]

nit: was spawned?

From the PAGE_TRANSITION_LINK comment: "User got to this page by clicking a link
on another page."

[Ben Kwa, 2016/07/22 17:58:06]

Egads.  Sorry, this page transition code is confusing.  Fixed now.

     return content::NavigationThrottle::PROCEED;
+  }
 
   if (!ShouldOverrideUrlLoading(navigation_handle()))
     return content::NavigationThrottle::PROCEED;