Hook up Reader Mode InfoBar

chrome/android/java/src/org/chromium/chrome/browser/dom_distiller/ReaderModeTabInfo.java

Index: chrome/android/java/src/org/chromium/chrome/browser/dom_distiller/ReaderModeTabInfo.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/dom_distiller/ReaderModeTabInfo.java b/chrome/android/java/src/org/chromium/chrome/browser/dom_distiller/ReaderModeTabInfo.java
index ef50dc74f30180ea38d63a543bcd73d3e6f7ab6d..c20b00cffb98c899b5e68524df42ae84528aad63 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/dom_distiller/ReaderModeTabInfo.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/dom_distiller/ReaderModeTabInfo.java
@@ -30,6 +30,12 @@ public class ReaderModeTabInfo {
     // Used to flag the the panel was shown and recorded by UMA.
     private boolean mShowPanelRecorded;
 
+    // The time that the user started viewing Reader Mode content.
+    private long mViewStartTimeMs;
+
+    // Whether or not the current tab is a Reader Mode page.
+    private boolean mIsViewingReaderModePage;
+
     /**
      * @param observer The WebContentsObserver for the tab this object represents.
      */
@@ -45,6 +51,31 @@ public class ReaderModeTabInfo {
     }
 
     /**
+     * A notification that the user started viewing Reader Mode.
+     */
+    public void onStartedReaderMode() {
+        mIsViewingReaderModePage = true;
+        mViewStartTimeMs = System.currentTimeMillis();

[wychen, 2017/05/17 07:24:12]

Monotonic time like elapsedRealtime() should be better.

[mdjones, 2017/05/17 16:52:14]

Done.

+    }
+
+    /**
+     * A notification that the user is no longer viewing Reader Mode. This could be because of a
+     * navigation away from the page, switching tabs, or closing the browser.
+     * @return The amount of time in ms that the user spent viewing Reader Mode.
+     */
+    public long onExitReaderMode() {
+        mIsViewingReaderModePage = false;
+        return System.currentTimeMillis() - mViewStartTimeMs;
+    }
+
+    /**
+     * @return Whether or not the user is on a Reader Mode page.
+     */
+    public boolean isViewingReaderModePage() {
+        return mIsViewingReaderModePage;
+    }
+
+    /**
      * @param status The status of reader mode for this object's tab.
      */
     public void setStatus(int status) {