Plumb the anonymize rect color to toolbar_layer from Tab#getThemeColor

chrome/android/java/src/org/chromium/chrome/browser/util/ColorUtils.java

Index: chrome/android/java/src/org/chromium/chrome/browser/util/ColorUtils.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/util/ColorUtils.java b/chrome/android/java/src/org/chromium/chrome/browser/util/ColorUtils.java
index b3e57a1c1e7398a8aff0e71a9e363f1a8c663ec3..6276c5a4b957bc7809b9377b2d2269b702717859 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/util/ColorUtils.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/util/ColorUtils.java
@@ -12,6 +12,7 @@ import android.graphics.Color;
 public class ColorUtils {
     private static final float CONTRAST_LIGHT_ITEM_THRESHOLD = 3f;
     private static final float LIGHTNESS_OPAQUE_BOX_THRESHOLD = 0.82f;
+    private static final float LOCATION_BAR_TRANSPARENT_BACKGROUND_ALPHA = 0.2f;
 
     /** Percentage to darken a color by when setting the status bar color. */
     private static final float DARKEN_COLOR_FRACTION = 0.6f;
@@ -44,6 +45,24 @@ public class ColorUtils {
     }
 
     /**
+     * @return The base color for the textbox given a toolbar background color.
+     */
+    public static int getTextBoxColorForToolbarBackground(int color) {
+        if (shouldUseOpaqueTextboxBackground(color)) return Color.WHITE;
+        return getColorWithOverlay(Color.WHITE, color, LOCATION_BAR_TRANSPARENT_BACKGROUND_ALPHA);
+    }
+
+    private static int getColorWithOverlay(int baseColor, int overlayColor, float overlayAlpha) {
+        return Color.rgb(
+            (int) (overlayAlpha * Color.red(baseColor)
+                    + (1f - overlayAlpha) * Color.red(overlayColor)),
+            (int) (overlayAlpha * Color.green(baseColor)
+                    + (1f - overlayAlpha) * Color.green(overlayColor)),
+            (int) (overlayAlpha * Color.blue(baseColor)
+                    + (1f - overlayAlpha) * Color.blue(overlayColor)));
+    }
+
+    /**
      * Darkens the given color to use on the status bar.
      * @param color Color which should be darkened.
      * @return Color that should be used for Android status bar.