Update Launcher to use theme colors.

Instead of using hard-coded variants of colors, use the theme color
that corresponds (colorAccent, colorPrimary, etc).

Updated:
- "Search for more apps" text
- App info drop target hover color
- PageIndicatorDots
- All apps & widget scroll bar & scroll popup colors
- All apps section text color
- widget picker background color

TODO:
- widget picker header color

BUG: 28625102
Change-Id: I74b543ff71b8caef8cd950c8183ac84c759cb4d5

src/com/android/launcher3/BaseContainerView.java

@@ -50,10 +50,10 @@ public abstract class BaseContainerView extends FrameLayout {
     public BaseContainerView(Context context, AttributeSet attrs, int defStyleAttr) {
         super(context, attrs, defStyleAttr);
 
-        int width = ((Launcher) context).getDeviceProfile().availableWidthPx;
+        Launcher launcher = Launcher.getLauncher(context);
+        int width = launcher.getDeviceProfile().availableWidthPx;
         if (FeatureFlags.LAUNCHER3_ALL_APPS_PULL_UP &&
-                this instanceof AllAppsContainerView &&
-                !((Launcher) context).getDeviceProfile().isLandscape) {
+                this instanceof AllAppsContainerView && launcher.getDeviceProfile().isLandscape) {
             mHorizontalPadding = 0;
         } else {
             mHorizontalPadding = DeviceProfile.getContainerPadding(context, width);
@@ -89,4 +89,4 @@ public abstract class BaseContainerView extends FrameLayout {
     public final View getRevealView() {
         return mRevealView;
     }
-}
+}