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

src/com/android/settings/SettingsActivity.java

@@ -337,6 +337,14 @@ public class SettingsActivity extends SettingsDrawerActivity
             Toolbar toolbar = findViewById(R.id.search_action_bar);
             toolbar.setOnClickListener(this);
             setActionBar(toolbar);
+
+            // Please forgive me for what I am about to do.
+            //
+            // Need to make the navigation icon non-clickable so that the entire card is clickable
+            // and goes to the search UI. Also set the background to null so there's no ripple.
+            View navView = toolbar.getNavigationView();
+            navView.setClickable(false);
+            navView.setBackground(null);
         }
 
         ActionBar actionBar = getActionBar();