[Android] Add support for a hung renderer dialog

chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java

Index: chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java b/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
index 22034cb6e799184a9ad511767f22756612be884b..726287a940a76679437870e9a6b0dbc1f85f9524 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
@@ -470,6 +470,7 @@ public class Tab implements ViewGroup.OnHierarchyChangeListener,
         @Override
         public void rendererUnresponsive() {
             super.rendererUnresponsive();
+            showHungRendererInfobar();
             if (mFullscreenManager == null) return;
             mFullscreenHungRendererToken =
                     mFullscreenManager.showControlsPersistentAndClearOldToken(
@@ -479,6 +480,7 @@ public class Tab implements ViewGroup.OnHierarchyChangeListener,
         @Override
         public void rendererResponsive() {
             super.rendererResponsive();
+            clearHungRendererInfobar();
             if (mFullscreenManager == null) return;
             mFullscreenManager.hideControlsPersistent(mFullscreenHungRendererToken);
             mFullscreenHungRendererToken = FullscreenManager.INVALID_TOKEN;
@@ -2785,6 +2787,16 @@ public class Tab implements ViewGroup.OnHierarchyChangeListener,
         return mParentIntent;
     }
 
+    private void showHungRendererInfobar() {
+        if (mNativeTabAndroid == 0) return;
+        nativeShowHungRendererInfoBar(mNativeTabAndroid);
+    }
+
+    private void clearHungRendererInfobar() {
+        if (mNativeTabAndroid == 0) return;
+        nativeClearHungRendererInfoBar(mNativeTabAndroid);
+    }
+
     /**
      * Creates a new tab to be loaded lazily. This can be used for tabs opened in the background
      * that should be loaded when switched to. initialize() needs to be called afterwards to
@@ -2850,6 +2862,8 @@ public class Tab implements ViewGroup.OnHierarchyChangeListener,
     private native void nativeDetachOverlayContentViewCore(long nativeTabAndroid,
             ContentViewCore content);
     private native boolean nativeHasPrerenderedUrl(long nativeTabAndroid, String url);
+    private native void nativeShowHungRendererInfoBar(long nativeTabAndroid);
+    private native void nativeClearHungRendererInfoBar(long nativeTabAndroid);
 
     private static native void nativeRecordStartupToCommitUma();
 }