[WebLayer] More cosmetic improvements on the URL bar.

1. Move the padding from the icon to the textview.
2. Reduce the padding to 5dp to improve aesthetics.
3. Set the color of the icon and the text to modern-grey-900.

Screenshots here:
https://drive.google.com/drive/folders/1gvXWF_0ZKFG0VDmEsqrUHbI45Dx2zJMz?usp=sharing

Bug: 1025607
Change-Id: I87200d7e4dc7f4436008136233ae99e31f154e71
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2130247Reviewed-by: Evan Stade <estade@chromium.org>
Commit-Queue: Mugdha Lakhani <nator@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755367}

weblayer/browser/java/res/layout/weblayer_url_bar.xml

@@ -12,20 +12,22 @@
         android:id="@+id/security_button"
         tools:ignore="ContentDescription"
         android:background="@android:color/transparent"
+        android:color="@color/modern_grey_900"
         android:layout_gravity="center_vertical"
         android:layout_height="@dimen/security_status_icon_size"
         android:layout_width="@dimen/security_status_icon_size"
         android:scaleType="center"
-        android:paddingEnd="@dimen/security_status_icon_padding"
         app:tint="@color/default_icon_color_tint_list"/>
 
     <TextView
         android:id="@+id/url_text"
+        android:textColor="@color/modern_grey_900"
         android:layout_height="wrap_content"
         android:layout_width="0dp"
         android:layout_weight="1"
         android:layout_gravity="center_vertical"
         android:maxLines="1"
-        android:paddingEnd="@dimen/url_text_edge_padding"/>
+        android:paddingEnd="@dimen/url_text_edge_padding"
+        android:paddingStart="@dimen/url_text_edge_padding"/>
 
 </merge>

weblayer/browser/java/res/values/dimens.xml

@@ -5,6 +5,5 @@
 
 <resources>
     <dimen name="security_status_icon_size">18dp</dimen>
-    <dimen name="security_status_icon_padding">5dp</dimen>
-    <dimen name="url_text_edge_padding">8dp</dimen>
+    <dimen name="url_text_edge_padding">5dp</dimen>
 </resources>
\ No newline at end of file

weblayer/shell/android/shell_apk/res/layout/shell_browser_controls.xml

@@ -18,7 +18,7 @@
         android:layout_height="wrap_content"
         android:layout_alignParentStart="true"
         android:layout_toStartOf="@+id/menu_button"
-        android:paddingStart="2dp">
+        android:paddingStart="5dp">
 
         <EditText
             android:id="@+id/editable_url_view"