onSwipeUp gesture added

src/chrome/browser/ui/android/toolbar/java/res/layout/toolbar_phone.xml

@@ -21,13 +21,13 @@ found in the LICENSE file.
         android:orientation="vertical">
 
     <FrameLayout
-        android:id="@+id/toolbar_frame_view"
+        android:id="@+id/toolbar_frame_view_top"
         android:layout_width="match_parent"
         android:layout_height="0dp"
         android:layout_weight="1"
         android:layout_margin="8dp"
         android:padding="0dp"
-        android:visibility="visible">
+        android:visibility="gone">
 
     <LinearLayout
         android:id="@+id/pinned_apps_container"
@@ -100,6 +100,7 @@ found in the LICENSE file.
             android:layout_gravity="top"
             android:visibility="gone"
             android:layout_width="52dp"
+            android:layout_height="56dp"
             style="@style/ToolbarHoverableButton" />
         </LinearLayout>
 

src/chrome/browser/ui/android/toolbar/java/src/org/chromium/chrome/browser/toolbar/top/ToolbarPhone.java

@@ -34,6 +34,8 @@
 import android.widget.FrameLayout;
 import android.widget.ImageView;
 import android.widget.TextView;
+import android.view.GestureDetector;
+import android.view.animation.DecelerateInterpolator;
 
 import androidx.annotation.ColorInt;
 import androidx.annotation.DrawableRes;
@@ -113,6 +115,8 @@ public class ToolbarPhone extends ToolbarLayout
     protected static final int TAB_SWITCHER = 1;
     protected static final int ENTERING_TAB_SWITCHER = 2;
     protected static final int EXITING_TAB_SWITCHER = 3;
+    private static final int SWIPE_THRESHOLD = 100;
+    private static final int SWIPE_VELOCITY_THRESHOLD = 100;
 
     @ViewDebug.ExportedProperty(
             category = "chrome",
@@ -132,6 +136,7 @@ public class ToolbarPhone extends ToolbarLayout
     private ObservableSupplier<Tracker> mTrackerSupplier;
 
     private ViewGroup mTabSwitcherButtonContainer;
+    private ViewGroup mToolbarFrameViewTop;
     private ViewGroup mOptionalButtonContainer;
     private ViewGroup mToolbarButtonsContainer;
     protected @Nullable ToggleTabStackButton mToggleTabStackButton;
@@ -142,6 +147,10 @@ public class ToolbarPhone extends ToolbarLayout
     protected ImageView mToolbarShadow;
     private OptionalButtonCoordinator mOptionalButtonCoordinator;
 
+    private GestureDetector gestureDetector;
+
+    private Context context;
+
     @ViewDebug.ExportedProperty(category = "chrome")
     protected int mTabSwitcherState;
 
@@ -334,6 +343,20 @@ public ToolbarPhone(Context context, AttributeSet attrs) {
         mHomeSurfaceToolbarBackgroundColor =
                 ChromeColors.getSurfaceColor(
                         getContext(), R.dimen.home_surface_background_color_elevation);
+
+         gestureDetector = new GestureDetector(getContext(), new GestureDetector.SimpleOnGestureListener() {
+            @Override
+            public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
+                final int SWIPE_THRESHOLD = 100;
+                final int SWIPE_VELOCITY_THRESHOLD = 100;
+
+                if (e1.getY() - e2.getY() > SWIPE_THRESHOLD && Math.abs(velocityY) > SWIPE_VELOCITY_THRESHOLD) {
+                    onSwipeUp();
+                    return true;
+                }
+                return false;
+            }
+        });
         if (mIsSurfacePolishEnabled) {
             float homeSurfaceLocationBarBackgroundColorAlpha =
                     ResourcesCompat.getFloat(
@@ -353,6 +376,7 @@ public void onFinishInflate() {
 
             mToolbarButtonsContainer = findViewById(R.id.toolbar_buttons);
             mOptionalButtonContainer = findViewById(R.id.optional_button_container);
+            mToolbarFrameViewTop = findViewById(R.id.toolbar_frame_view_top);
             mTabSwitcherButtonContainer = findViewById(R.id.tab_switcher_button_container);
             mHomeButton = findViewById(R.id.home_button);
             mUrlBar = findViewById(R.id.url_bar);
@@ -599,6 +623,10 @@ public boolean onTouchEvent(MotionEvent ev) {
             return getToolbarDataProvider().getNewTabPageDelegate().dispatchTouchEvent(ev);
         }
 
+        if (gestureDetector != null) {
+            gestureDetector.onTouchEvent(ev);
+        }
+
         return super.onTouchEvent(ev);
     }
 
@@ -3201,7 +3229,16 @@ void setNtpSearchBoxScrollFractionForTesting(float ntpSearchBoxScrollFraction) {
         mNtpSearchBoxScrollFraction = ntpSearchBoxScrollFraction;
     }
 
-    public void ShowTabSwitcherToolbarContiainer() {
-        return;
+    private void onSwipeUp() {
+        if (mToolbarFrameViewTop.getVisibility() == View.GONE) {
+            mToolbarFrameViewTop.setVisibility(View.VISIBLE);
+
+            mToolbarFrameViewTop.setTranslationY(200);
+            mToolbarFrameViewTop.animate()
+                    .translationY(0)
+                    .setDuration(300)
+                    .setInterpolator(new DecelerateInterpolator())
+                    .start();
+        }
     }
 }