Closes #134 - Collapse/show the toolbar based on browser scrolling

app/src/main/java/org/mozilla/fenix/home/HomeFragment.kt

@@ -44,7 +44,7 @@ class HomeFragment : Fragment() {
         toolbar_wrapper.clipToOutline = false
         toolbar.setOnClickListener { it ->
             val extras = FragmentNavigator.Extras.Builder().addSharedElement(
-                toolbar_wrapper, ViewCompat.getTransitionName(toolbar_wrapper)!!
+                toolbar, ViewCompat.getTransitionName(toolbar)!!
             ).build()
             Navigation.findNavController(it).navigate(R.id.action_homeFragment_to_browserFragment, null, null, extras)
         }

app/src/main/res/layout/fragment_browser.xml

@@ -2,52 +2,45 @@
 <!-- This Source Code Form is subject to the terms of the Mozilla Public
    - License, v. 2.0. If a copy of the MPL was not distributed with this
    - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-<androidx.constraintlayout.widget.ConstraintLayout
-        xmlns:android="http://schemas.android.com/apk/res/android"
-        xmlns:app="http://schemas.android.com/apk/res-auto"
-        xmlns:tools="http://schemas.android.com/tools"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        tools:context=".browser.BrowserFragment">
+<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:mozac="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context="browser.BrowserFragment">
 
     <FrameLayout
-        android:layout_width="0dp"
-        android:layout_height="0dp"
-        app:layout_constraintTop_toTopOf="parent"
-        app:layout_constraintBottom_toTopOf="@id/toolbar_wrapper"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent">
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
 
         <mozilla.components.concept.engine.EngineView
-                android:id="@+id/engineView"
-                android:layout_width="match_parent"
-                android:layout_height="match_parent" />
-    </FrameLayout>
+            android:id="@+id/engineView"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent" />
 
-    <FrameLayout
-            android:id="@+id/toolbar_wrapper"
-            android:layout_width="0dp"
+        <mozilla.components.browser.awesomebar.BrowserAwesomeBar
+            android:id="@+id/awesomeBar"
+            android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:layout_marginLeft="16dp"
-            android:layout_marginTop="24dp"
-            android:layout_marginRight="16dp"
-            android:background="@drawable/home_search_background"
-            android:clipToPadding="false"
-            android:elevation="5dp"
-            android:outlineProvider="paddedBounds"
-            android:transitionName="firstTransitionName"
-            app:layout_constraintEnd_toEndOf="parent"
-            app:layout_constraintStart_toStartOf="parent"
-            app:layout_constraintBottom_toBottomOf="parent">
-
-        <mozilla.components.browser.toolbar.BrowserToolbar
-                android:id="@+id/toolbar"
-                android:layout_width="match_parent"
-                android:layout_height="40dp"
-                android:layout_margin="8dp"
-                android:background="@android:color/white"
-                android:clickable="true"
-                android:focusable="true"
-                android:focusableInTouchMode="true" />
+            android:padding="4dp"
+            android:visibility="gone"
+            mozac:awesomeBarChipBackgroundColor="#444444"
+            mozac:awesomeBarChipTextColor="#ffffff"
+            mozac:awesomeBarDescriptionTextColor="#dddddd"
+            mozac:awesomeBarTitleTextColor="#ffffff" />
     </FrameLayout>
-</androidx.constraintlayout.widget.ConstraintLayout>
+
+    <mozilla.components.browser.toolbar.BrowserToolbar
+        android:id="@+id/toolbar"
+        android:layout_width="match_parent"
+        android:layout_height="56dp"
+        android:layout_gravity="bottom"
+        android:background="@android:color/white"
+        android:clickable="true"
+        android:focusable="true"
+        android:focusableInTouchMode="true"
+        android:transitionName="firstTransitionName"
+        app:layout_behavior="mozilla.components.browser.toolbar.behavior.BrowserToolbarBottomBehavior"
+        app:layout_scrollFlags="scroll|enterAlways|snap|exitUntilCollapsed" />
+</androidx.coordinatorlayout.widget.CoordinatorLayout>

app/src/main/res/layout/fragment_home.xml

@@ -12,7 +12,6 @@
     app:layoutDescription="@xml/home_scene"
     tools:context=".home.HomeFragment">
 
-
     <ImageButton
         android:id="@+id/menuButton"
         android:layout_width="@dimen/glyph_button_height"
@@ -53,7 +52,6 @@
         android:clipToPadding="false"
         android:elevation="5dp"
         android:outlineProvider="paddedBounds"
-        android:transitionName="firstTransitionName"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toBottomOf="@id/wordmark">
@@ -69,7 +67,8 @@
             android:gravity="center_vertical"
             android:text="@string/search_hint"
             android:textColor="@color/searchText"
-            android:textSize="14sp" />
+            android:textSize="14sp"
+            android:transitionName="firstTransitionName" />
     </FrameLayout>
 
     <androidx.recyclerview.widget.RecyclerView