Stop infobar autohiding when Touch Exploration enabled

Adds a way to stop InfoBars and SwipableOverlayViews from auto-hiding.

BUG=452614

Review URL: https://codereview.chromium.org/968453002

Cr-Commit-Position: refs/heads/master@{#318542}

chrome/android/java/src/org/chromium/chrome/browser/banners/SwipableOverlayView.java

@@ -250,10 +250,17 @@ public abstract class SwipableOverlayView extends ScrollView {
     protected void onAttachedToWindow() {
         super.onAttachedToWindow();
         if (!mDoStayInvisible) {
-            ObjectAnimator.ofFloat(this, "alpha", 0.f, 1.f).setDuration(REATTACH_FADE_IN_MS)
+            ObjectAnimator.ofFloat(this, View.ALPHA, 0.f, 1.f).setDuration(REATTACH_FADE_IN_MS)
                     .start();
             setVisibility(VISIBLE);
         }
+        if (!isAllowedToAutoHide()) setTranslationY(0.0f);
+    }
+
+    @Override
+    public void onWindowFocusChanged(boolean hasWindowFocus) {
+        super.onWindowFocusChanged(hasWindowFocus);
+        if (!isAllowedToAutoHide()) setTranslationY(0.0f);
     }
 
     /**
@@ -406,7 +413,7 @@ public abstract class SwipableOverlayView extends ScrollView {
         return new GestureStateListener() {
             @Override
             public void onFlingStartGesture(int vx, int vy, int scrollOffsetY, int scrollExtentY) {
-                if (!cancelCurrentAnimation()) return;
+                if (!isAllowedToAutoHide() || !cancelCurrentAnimation()) return;
                 beginGesture(scrollOffsetY, scrollExtentY);
                 mGestureState = GESTURE_FLINGING;
             }
@@ -442,7 +449,7 @@ public abstract class SwipableOverlayView extends ScrollView {
 
             @Override
             public void onScrollStarted(int scrollOffsetY, int scrollExtentY) {
-                if (!cancelCurrentAnimation()) return;
+                if (!isAllowedToAutoHide() || !cancelCurrentAnimation()) return;
                 beginGesture(scrollOffsetY, scrollExtentY);
                 mGestureState = GESTURE_SCROLLING;
             }
@@ -692,6 +699,13 @@ public abstract class SwipableOverlayView extends ScrollView {
         return !mIsBeingDisplayedForFirstTime && !mIsDismissed;
     }
 
+    /**
+     * @return Whether the SwipableOverlayView is allowed to hide itself on scroll.
+     */
+    protected boolean isAllowedToAutoHide() {
+        return true;
+    }
+
     /**
      * Override gatherTransparentRegion to make this view's layout a placeholder for its
      * animations. This is only called during layout, so it doesn't really make sense to apply

chrome/android/java/src/org/chromium/chrome/browser/infobar/InfoBarContainer.java

@@ -40,6 +40,9 @@ public class InfoBarContainer extends SwipableOverlayView {
     private static final int TAB_STRIP_AND_TOOLBAR_HEIGHT_PHONE_DP = 56;
     private static final int TAB_STRIP_AND_TOOLBAR_HEIGHT_TABLET_DP = 96;
 
+    /** WHether or not the InfoBarContainer is allowed to hide when the user scrolls. */
+    private static boolean sIsAllowedToAutoHide;
+
     /**
      * A listener for the InfoBar animation.
      */
@@ -520,6 +523,20 @@ public class InfoBarContainer extends SwipableOverlayView {
         return mNativeInfoBarContainer;
     }
 
+    /**
+     * Sets whether the InfoBarContainer is allowed to auto-hide when the user scrolls the page.
+     * Expected to be called when Touch Exploration is enabled.
+     * @param isAllowed Whether auto-hiding is allowed.
+     */
+    public static void setIsAllowedToAutoHide(boolean isAllowed) {
+        sIsAllowedToAutoHide = isAllowed;
+    }
+
+    @Override
+    protected boolean isAllowedToAutoHide() {
+        return sIsAllowedToAutoHide;
+    }
+
     @Override
     protected void onViewSwipedAway() {
         assert false;