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, 19 insertions, 0 deletions

diff --git a/ui/app/helpers/conversions.util.js b/ui/app/helpers/conversions.util.js
index 20ef9e35b..777537e1e 100644
--- a/ui/app/helpers/conversions.util.js
+++ b/ui/app/helpers/conversions.util.js
@@ -61,3 +61,22 @@ export function getValueFromWeiHex ({
     conversionRate,
   })
 }
+
+export function getWeiHexFromDecimalValue ({
+  value,
+  fromCurrency,
+  conversionRate,
+  fromDenomination,
+  invertConversionRate,
+}) {
+  return conversionUtil(value, {
+    fromNumericBase: 'dec',
+    toNumericBase: 'hex',
+    toCurrency: ETH,
+    fromCurrency,
+    conversionRate,
+    invertConversionRate,
+    fromDenomination,
+    toDenomination: WEI,
+  })
+}