[fenix] For https://github.com/mozilla-mobile/fenix/issues/9728: Change SearchView hint color inside app.

app/src/main/res/values/colors.xml

@@ -278,4 +278,7 @@
 
     <!-- Static Shortcut Background Color -->
     <color name="static_shortcut_background">#F5F5F5</color>
+
+    <!-- SearchView Hint Color -->
+    <color name="search_view_hint_color">#5B5B66</color>
 </resources>

app/src/main/res/values/styles.xml

@@ -7,6 +7,7 @@
     <style name="NormalThemeBase" parent="Theme.MaterialComponents.DayNight.NoActionBar.Bridge">
         <!-- Android system styling -->
         <item name="searchViewStyle">@style/SearchViewStyle</item>
+        <item name="autoCompleteTextViewStyle">@style/AutoCompleteTextViewStyle</item>
         <item name="android:windowContentTransitions">true</item>
         <item name="android:windowAnimationStyle">@style/WindowAnimationTransition</item>
         <item name="android:progressBarStyleHorizontal">@style/progressBarStyleHorizontal</item>
@@ -20,7 +21,7 @@
         <item name="alertDialogTheme">@style/DialogStyleNormal</item>
         <item name="android:windowEnableSplitTouch">false</item>
         <item name="android:splitMotionEvents">false</item>
-        
+
         <item name="mozacInputLayoutErrorTextColor"
             tools:ignore="UnusedResources">@color/destructive_normal_theme</item>
         <item name="mozacInputLayoutErrorIconColor"
@@ -117,6 +118,7 @@
     <style name="PrivateThemeBase" parent="Theme.MaterialComponents.NoActionBar.Bridge">
         <!-- Android system styling -->
         <item name="searchViewStyle">@style/SearchViewStyle</item>
+        <item name="autoCompleteTextViewStyle">@style/AutoCompleteTextViewStyle</item>
         <item name="android:windowContentTransitions">true</item>
         <item name="android:windowAnimationStyle">@style/WindowAnimationTransition</item>
         <item name="android:progressBarStyleHorizontal">@style/progressBarStyleHorizontal</item>
@@ -494,4 +496,8 @@
     <style name="SearchViewStyle" parent="Widget.AppCompat.SearchView">
         <item name="searchHintIcon">@null</item>
     </style>
+
+    <style name="AutoCompleteTextViewStyle" parent="Widget.AppCompat.AutoCompleteTextView">
+        <item name="android:textColorHint">@color/search_view_hint_color</item>
+    </style>
 </resources>