Plumb the anonymize rect color to toolbar_layer from Tab#getThemeColor

chrome/android/java/src/org/chromium/chrome/browser/document/BrandColorUtils.java

Index: chrome/android/java/src/org/chromium/chrome/browser/document/BrandColorUtils.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/document/BrandColorUtils.java b/chrome/android/java/src/org/chromium/chrome/browser/document/BrandColorUtils.java
index 1333ed4059e856a2de49b490dfa09ab0385e8dc8..2e41fe7bd10826f0dfe7c14061b08c01cc4c44f0 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/document/BrandColorUtils.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/document/BrandColorUtils.java
@@ -12,6 +12,7 @@ import android.graphics.Color;
 public class BrandColorUtils {
     private static final float CONTRAST_LIGHT_TEXT_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 the brand color by when setting the status bar color. */
     private static final float DARKEN_COLOR_FRACTION = 0.6f;
@@ -44,6 +45,25 @@ public class BrandColorUtils {
     }
 
     /**
+     * @return The base color for the textbox given a toolbar background color.
+     */
+    public static int getTextBoxColorForToolbarBackground(int color) {
+        boolean shouldUseOpaqueTextboxBackground = shouldUseOpaqueTextboxBackground(color);
+        if (shouldUseOpaqueTextboxBackground) return Color.WHITE;
+        return getColorWithOverlay(Color.WHITE, color, LOCATION_BAR_TRANSPARENT_BACKGROUND_ALPHA);
+    }
+
+    private static int getColorWithOverlay(int baseColor, int overlayColor, float overlayAlpha) {

[David Trainor- moved to gerrit, 2015/08/03 20:12:44]

cache 1.f - overlayAlpha to baseAlpha IMO.

+        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 Brand color of the website.
      * @return Color that should be used for Android status bar.