Various theme picker fixes.

- Add Previous button to custom flow
- Seed custom flow with the currently applied bundled theme
- Use add drawable icon instead of text
- Add padding between checkbox and "Add current wallpaper"
- Show ripple background on "Tap to edit"

Fixes: 130763331
Fixes: 130753131
Fixes: 130761402
Fixes: 130759176
Bug: 130759508
Test: visual
Change-Id: Ia82344befe8ac45489646d840453a71e31c83eae
diff --git a/res/layout/activity_custom_theme.xml b/res/layout/activity_custom_theme.xml
index 82b7887..b2aaa73 100644
--- a/res/layout/activity_custom_theme.xml
+++ b/res/layout/activity_custom_theme.xml
@@ -35,6 +35,13 @@
         android:layout_height="@dimen/custom_theme_nav_height"
         android:layout_marginHorizontal="12dp">
         <Button
+            android:id="@+id/previous_button"
+            style="@style/ActionSecondaryButton"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="start|center_vertical"
+            android:text="@string/custom_theme_previous"/>
+        <Button
             android:id="@+id/next_button"
             style="@style/ActionPrimaryButton"
             android:layout_width="wrap_content"
diff --git a/res/layout/custom_theme_option.xml b/res/layout/custom_theme_option.xml
index b249555..09bd58e 100644
--- a/res/layout/custom_theme_option.xml
+++ b/res/layout/custom_theme_option.xml
@@ -34,13 +34,11 @@
         android:paddingHorizontal="@dimen/option_tile_padding_horizontal"
         android:paddingVertical="@dimen/option_tile_padding_vertical"
         android:background="@drawable/option_border">
-        <TextView
+        <ImageView
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_gravity="center"
-            android:textSize="@dimen/theme_option_add_size"
-            android:textAlignment="center"
-            android:textColor="?android:colorAccent"
-            android:text="@string/add_custom_theme"/>
+            android:src="@drawable/ic_add_24px"
+            android:tint="?android:attr/colorAccent" />
     </FrameLayout>
 </LinearLayout>
diff --git a/res/layout/fragment_theme_picker.xml b/res/layout/fragment_theme_picker.xml
index ffc2d7b..c73bf63 100644
--- a/res/layout/fragment_theme_picker.xml
+++ b/res/layout/fragment_theme_picker.xml
@@ -51,6 +51,7 @@
                 android:layout_height="wrap_content"
                 android:layout_alignParentStart="true"
                 android:layout_centerVertical="true"
+                android:paddingLeft="4dp"
                 android:minHeight="@dimen/min_taptarget_height"
                 android:text="@string/keep_my_wallpaper"/>
             <Button
diff --git a/res/layout/theme_preview_card.xml b/res/layout/theme_preview_card.xml
index 277a739..deccd48 100644
--- a/res/layout/theme_preview_card.xml
+++ b/res/layout/theme_preview_card.xml
@@ -65,10 +65,9 @@
                 android:layout_gravity="center_horizontal"
                 android:drawableStart="@drawable/ic_tune_24px"
                 android:drawablePadding="8dp"
-                android:drawableTint="?android:colorAccent"
                 android:gravity="center"
                 android:text="@string/edit_custom_theme_lbl"
-                android:textAppearance="@style/EditLabelTextAppearance"
+                style="@style/EditLabelStyle"
                 android:visibility="invisible"/>
         </LinearLayout>
     </FrameLayout>