Add theme color for Blimp on Android.

blimp/client/core/contents/android/java/src/org/chromium/blimp/core/contents/BlimpContentsImpl.java

Index: blimp/client/core/contents/android/java/src/org/chromium/blimp/core/contents/BlimpContentsImpl.java
diff --git a/blimp/client/core/contents/android/java/src/org/chromium/blimp/core/contents/BlimpContentsImpl.java b/blimp/client/core/contents/android/java/src/org/chromium/blimp/core/contents/BlimpContentsImpl.java
index a90a803bb8a700f688cbcf577f7804a9f586c3af..895befe2f1b31f980a3d5cdf0326ce85a7e3a52b 100644
--- a/blimp/client/core/contents/android/java/src/org/chromium/blimp/core/contents/BlimpContentsImpl.java
+++ b/blimp/client/core/contents/android/java/src/org/chromium/blimp/core/contents/BlimpContentsImpl.java
@@ -25,6 +25,9 @@ public class BlimpContentsImpl implements BlimpContents {
                 nativeBlimpContentsImplAndroid, navigationController, blimpView);
     }
 
+    // Light blue theme color on Blimp tab.
+    private static final int BLIMP_THEME_COLOR = 0xb3e5fc;
+
     private long mNativeBlimpContentsImplAndroid;
 
     // Given the importance of the navigation controller, this member is kept directly in Java to
@@ -72,6 +75,13 @@ public class BlimpContentsImpl implements BlimpContents {
         return mBlimpNavigationController;
     }
 
+    // TODO(xingliu): Use the correct theme color for Blimp.
+    // crbug.com/644774
+    @Override
+    public int getThemeColor() {
+        return BLIMP_THEME_COLOR;
+    }
+
     @Override
     public void addObserver(BlimpContentsObserver observer) {
         assert mNativeBlimpContentsImplAndroid != 0;