Upstream Chrome on iOS source code [4/11].

ios/chrome/browser/ui/fancy_ui/primary_action_button.mm

+// Copyright 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "ios/chrome/browser/ui/fancy_ui/primary_action_button.h"
+
+#import "ios/chrome/browser/ui/colors/MDCPalette+CrAdditions.h"
+
+@implementation PrimaryActionButton
+
+- (id)initWithFrame:(CGRect)frame {
+  self = [super initWithFrame:frame];
+  if (self)
+    [self initializeStyling];
+  return self;
+}
+
+- (id)initWithCoder:(NSCoder*)aDecoder {
+  self = [super initWithCoder:aDecoder];
+  if (self)
+    [self initializeStyling];
+  return self;
+}
+
+- (void)awakeFromNib {
+  [super awakeFromNib];
+  [self initializeStyling];
+}
+
+- (void)initializeStyling {
+  self.hasOpaqueBackground = YES;
+  self.underlyingColorHint = [UIColor whiteColor];
+  self.inkColor =
+      [[[MDCPalette cr_bluePalette] tint300] colorWithAlphaComponent:0.5f];
+  [self setBackgroundColor:[[MDCPalette cr_bluePalette] tint500]
+                  forState:UIControlStateNormal];
+  [self setBackgroundColor:[UIColor colorWithWhite:0.6f alpha:1.0f]
+                  forState:UIControlStateDisabled];
+  self.customTitleColor = [UIColor whiteColor];
+}
+
+@end