Reader Mode support for low-end devices

chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/readermode/ReaderModePanel.java

Index: chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/readermode/ReaderModePanel.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/readermode/ReaderModePanel.java b/chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/readermode/ReaderModePanel.java
index 51e3f90a8144af2c536c1138ea14737f5254566d..91a654edd328dce1e1b7907d7f506699f19622c2 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/readermode/ReaderModePanel.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/readermode/ReaderModePanel.java
@@ -165,18 +165,47 @@ public class ReaderModePanel extends OverlayPanel {
 
     @Override
     public void handleBarClick(long time, float x, float y) {
-        super.handleBarClick(time, x, y);
+        handleBarClickInternal(x, y, true);
+    }
+
+    @Override
+    public boolean onInterceptBarClick(float x, float y) {
+        boolean supportsSwipe = mManagerDelegate != null
+                ? mManagerDelegate.supportsOverlayPanelUI() : false;
+        handleBarClickInternal(x, y, supportsSwipe);
+        return !supportsSwipe;
+    }
+
+    /**
+     * Handle normal bar clicks and low-end device clicks.
+     * @param x The X position of the gesture.
+     * @param y The Y position of the gesture.
+     * @param supportsSwipe If the device supports the swipable version of the overlay.
+     */
+    private void handleBarClickInternal(float x, float y, boolean supportsSwipe) {
         if (isCoordinateInsideCloseButton(x)) {
             closePanel(StateChangeReason.CLOSE_BUTTON, true);
         } else {
-            maximizePanel(StateChangeReason.SEARCH_BAR_TAP);
+            if (supportsSwipe) {
+                maximizePanel(StateChangeReason.SEARCH_BAR_TAP);
+            } else {
+                // Handle devices that do not support the swipable overlay.
+                mManagerDelegate.distillInCustomTab();
+            }
         }
     }
 
     @Override
-    public boolean onInterceptBarClick() {
-        // TODO(mdjones): Handle compatibility mode here (promote to tab on tap).
-        return false;
+    public boolean onInterceptBarSwipe() {
+        boolean supportsSwipe = mManagerDelegate != null
+                ? mManagerDelegate.supportsOverlayPanelUI() : false;
+        if (!supportsSwipe) mManagerDelegate.distillInCustomTab();
+        return !supportsSwipe;
+    }
+
+    @Override
+    public boolean supportsContextualSearchLayout() {
+        return mManagerDelegate != null ? mManagerDelegate.supportsOverlayPanelUI() : false;
     }
 
     // ============================================================================================