Dashboard search bar polish

Various tweaks to match redlines:
- background is now grey all the time
- the search icon is aligned with the other icons
- the title text is primary colored instead of accent colored
- the background of search bar doesn't scroll anymore

Deletes a bunch of logic to add an initial view that would be
colored based on the first view. It never quite worked right.
Now it's consistent and never moves.

Bug: 37477506
Change-Id: I82c584e8f8ecc6fc298c5cdbce08516c6a069a39
Fixes: 62267378
Fixes: 62379978
Fixes: 62361213
Test: robotests

tests/robotests/src/com/android/settings/dashboard/DashboardDataTest.java

@@ -118,8 +118,8 @@ public class DashboardDataTest {
     public void testBuildItemsData_containsAllData() {
         final DashboardData.SuggestionConditionHeaderData data =
                 new DashboardData.SuggestionConditionHeaderData(
-                        mDashboardDataWithOneConditions.getConditions(), 0);
-        final Object[] expectedObjects = {null, data,
+                    mDashboardDataWithOneConditions.getConditions(), 0);
+        final Object[] expectedObjects = {data,
                 mDashboardDataWithOneConditions.getSuggestions(),
                 mDashboardDataWithOneConditions.getConditions(),
                 null, mTestCategoryTile};
@@ -198,11 +198,11 @@ public class DashboardDataTest {
         // Item in position 1 is the header, which contains the number of conditions, changed from
         // 1 to 2
         testResultData.add(new ListUpdateResult.ResultData(
-                ListUpdateResult.ResultData.TYPE_OPERATION_CHANGE, 1, 1));
+                ListUpdateResult.ResultData.TYPE_OPERATION_CHANGE, 0, 1));
         // Item in position 3 is the condition container containing the list of conditions, which
         // gets 1 more item
         testResultData.add(new ListUpdateResult.ResultData(
-            ListUpdateResult.ResultData.TYPE_OPERATION_CHANGE, 3, 1));
+            ListUpdateResult.ResultData.TYPE_OPERATION_CHANGE, 2, 1));
 
         testDiffUtil(mDashboardDataWithOneConditions,
                 mDashboardDataWithTwoConditions, testResultData);
@@ -213,7 +213,7 @@ public class DashboardDataTest {
         //Build testResultData
         final List<ListUpdateResult.ResultData> testResultData = new ArrayList<>();
         testResultData.add(new ListUpdateResult.ResultData(
-                ListUpdateResult.ResultData.TYPE_OPERATION_REMOVE, 1, 5));
+                ListUpdateResult.ResultData.TYPE_OPERATION_REMOVE, 0, 5));
 
         testDiffUtil(mDashboardDataWithOneConditions, mDashboardDataWithNoItems, testResultData);
     }