Add chrome custom tabs dependency

dependencies.gradle

@@ -12,7 +12,8 @@ ext {
             constraintLayout    : "com.android.support.constraint:constraint-layout:${constraintLayoutVersion}",
             cardView            : "com.android.support:cardview-v7:${supportLibraryVersion}",
             supportV13          : "com.android.support:support-v13:${supportLibraryVersion}",
-            multidex            : "com.android.support:multidex:1.0.2"
+            multidex            : "com.android.support:multidex:1.0.2",
+            customTabs          : "com.android.support:customtabs:${supportLibraryVersion}"
     ]
     extraDependencies = [
             okHTTP         : "com.squareup.okhttp3:okhttp:${okHttpVersion}",

rocket-chat-android-widgets/build.gradle

@@ -39,6 +39,7 @@ dependencies {
     compile supportDependencies.designSupportLibrary
     compile supportDependencies.constraintLayout
     compile supportDependencies.supportV13
+    compile supportDependencies.customTabs
     compile rxbindingDependencies.rxBinding
     compile rxbindingDependencies.rxBindingSupport
     compile "org.jetbrains.kotlin:kotlin-stdlib-jre7:$rootProject.ext.kotlinVersion"

rocket-chat-android-widgets/src/main/res/values/colors.xml

 <?xml version="1.0" encoding="utf-8"?>
 <resources>
   <color name="color_accent">#FF2D91FA</color>
+  <color name="colorPrimary">#044b76</color>
+  <color name="colorPrimaryDark">#FFF</color>
   <color name="color_shadow">#FFE6E6E7</color>
   <color name="color_icon_composer">#FFA8A8A8</color>