Adds toggle for primary currency (#5421)

* Add UnitInput component

* Add CurrencyInput component

* Add UserPreferencedCurrencyInput component

* Add UserPreferencedCurrencyDisplay component

* Add updatePreferences action

* Add styles for CurrencyInput, CurrencyDisplay, and UnitInput

* Update SettingsTab page with Primary Currency toggle

* Refactor currency displays and inputs to use UserPreferenced displays and inputs

* Add TokenInput component

* Add UserPreferencedTokenInput component

* Use TokenInput in the send screen

* Fix unit tests

* Fix e2e and integration tests

* Remove send/CurrencyDisplay component

* Replace diamond unicode character with Eth logo. Fix typos

1 files changed, 8 insertions, 3 deletions

diff --git a/ui/app/components/currency-display/currency-display.component.js b/ui/app/components/currency-display/currency-display.component.js
index e4eb58a2a..5f5717be3 100644
--- a/ui/app/components/currency-display/currency-display.component.js
+++ b/ui/app/components/currency-display/currency-display.component.js
@@ -1,5 +1,6 @@
 import React, { PureComponent } from 'react'
 import PropTypes from 'prop-types'
+import classnames from 'classnames'
 import { ETH, GWEI } from '../../constants/common'
 
 export default class CurrencyDisplay extends PureComponent {
@@ -7,6 +8,8 @@ export default class CurrencyDisplay extends PureComponent {
     className: PropTypes.string,
     displayValue: PropTypes.string,
     prefix: PropTypes.string,
+    prefixComponent: PropTypes.node,
+    style: PropTypes.object,
     // Used in container
     currency: PropTypes.oneOf([ETH]),
     denomination: PropTypes.oneOf([GWEI]),
@@ -16,15 +19,17 @@ export default class CurrencyDisplay extends PureComponent {
   }
 
   render () {
-    const { className, displayValue, prefix } = this.props
+    const { className, displayValue, prefix, prefixComponent, style } = this.props
     const text = `${prefix || ''}${displayValue}`
 
     return (
       <div
-        className={className}
+        className={classnames('currency-display-component', className)}
+        style={style}
         title={text}
       >
-        { text }
+        { prefixComponent}
+        <span className="currency-display-component__text">{ text }</span>
       </div>
     )
   }