[Smart Lock, UI] Add ability to have an icon to the SnanackBar.

chrome/android/java/src/org/chromium/chrome/browser/snackbar/Snackbar.java

Index: chrome/android/java/src/org/chromium/chrome/browser/snackbar/Snackbar.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/snackbar/Snackbar.java b/chrome/android/java/src/org/chromium/chrome/browser/snackbar/Snackbar.java
index f4055dc59b2620e140843d156d996ae2a16e6661..e15bc65e9fdffe91f8a3c11d52e28abce75c06f4 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/snackbar/Snackbar.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/snackbar/Snackbar.java
@@ -4,6 +4,8 @@
 
 package org.chromium.chrome.browser.snackbar;
 
+import android.graphics.Bitmap;
+
 import org.chromium.chrome.browser.snackbar.SnackbarManager.SnackbarController;
 
 /**
@@ -26,6 +28,7 @@ public class Snackbar {
     private int mBackgroundColor;
     private boolean mSingleLine = true;
     private int mDurationMs;
+    private Bitmap mIcon;
 
     // Prevent instantiation.
     private Snackbar() {}
@@ -65,6 +68,14 @@ public class Snackbar {
     }
 
     /**
+     * Sets the icon which should be displayed in the snackbar. If null, snackbar will have no icon.
+     */
+    public Snackbar setIcon(Bitmap icon) {

[gone, 2015/11/10 00:35:04]

The spec says that an "icon" only gets added for identity toasts.  Can you make
that requirement explicit and call this function "setProfileImage" (adjusting
all related names accordingly)?  I don't want random Snackbars landing in the
future that will conflict with the Material Design spec.

[gone, 2015/11/10 00:44:41]

Also, could you make javadoc say explicitly that this should only be used for
identity toasts?

+        mIcon = icon;
+        return this;
+    }
+
+    /**
      * Sets whether the snackbar text should be limited to a single line and ellipsized if needed.
      */
     public Snackbar setSingleLine(boolean singleLine) {
@@ -123,4 +134,11 @@ public class Snackbar {
     int getBackgroundColor() {
         return mBackgroundColor;
     }
+
+    /**
+     * If method returns null, then no icon will be shown in snackbar.
+     */
+    Bitmap getIcon() {
+        return mIcon;
+    }
 }