[ios] Adds support for Find in Page to the new architecture.

ios/clean/chrome/browser/ui/tab/tab_container_view_controller.mm

 // Copyright 2016 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/clean/chrome/browser/ui/tab/tab_container_view_controller.h"
 
 #import "ios/clean/chrome/browser/ui/tab_strip/tab_strip_events.h"
 #import "ios/clean/chrome/browser/ui/ui_types.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 namespace {
 CGFloat kToolbarHeight = 44.0f;
 CGFloat kTabStripHeight = 120.0f;
 }
 
 @interface TabContainerViewController ()
 
 // Container views for child view controllers. The child view controller's
-// view is added as a subview that fills it's container view via autoresizing.
+// view is added as a subview that fills its container view via autoresizing.
+@property(nonatomic, strong) UIView* findBarView;
 @property(nonatomic, strong) UIView* tabStripView;
 @property(nonatomic, strong) UIView* toolbarView;
 @property(nonatomic, strong) UIView* contentView;
 
 // Height constraints for tabStripView and toolbarView.
 @property(nonatomic, strong) NSLayoutConstraint* tabStripHeightConstraint;
 @property(nonatomic, strong) NSLayoutConstraint* toolbarHeightConstraint;
 
 // Cache for forwarding methods to child view controllers.
 @property(nonatomic, assign) SEL actionToForward;
 @property(nonatomic, weak) UIResponder* forwardingTarget;
 
 // Abstract base method for subclasses to implement.
 // Returns constraints for tabStrip, toolbar, and content subviews.
 - (Constraints*)subviewConstraints;
 
 @end
 
 @implementation TabContainerViewController
 
 @synthesize contentViewController = _contentViewController;
+@synthesize findBarView = _findBarView;
+@synthesize findBarViewController = _findBarViewController;
 @synthesize toolbarViewController = _toolbarViewController;
 @synthesize tabStripViewController = _tabStripViewController;
 @synthesize tabStripView = _tabStripView;
 @synthesize toolbarView = _toolbarView;
 @synthesize contentView = _contentView;
 @synthesize tabStripHeightConstraint = _tabStripHeightConstraint;
 @synthesize toolbarHeightConstraint = _toolbarHeightConstraint;
 @synthesize actionToForward = _actionToForward;
 @synthesize forwardingTarget = _forwardingTarget;
 
 #pragma mark - UIViewController
 
 - (void)viewDidLoad {
   [super viewDidLoad];
+  self.findBarView = [[UIView alloc] init];
   self.tabStripView = [[UIView alloc] init];
   self.toolbarView = [[UIView alloc] init];
   self.contentView = [[UIView alloc] init];
-  [self.view addSubview:self.tabStripView];
-  [self.view addSubview:self.toolbarView];
-  [self.view addSubview:self.contentView];
+  self.findBarView.translatesAutoresizingMaskIntoConstraints = NO;
   self.tabStripView.translatesAutoresizingMaskIntoConstraints = NO;
   self.toolbarView.translatesAutoresizingMaskIntoConstraints = NO;
   self.contentView.translatesAutoresizingMaskIntoConstraints = NO;
   self.view.backgroundColor = [UIColor blackColor];
+  self.findBarView.backgroundColor = [UIColor greenColor];
   self.tabStripView.backgroundColor = [UIColor blackColor];
   self.toolbarView.backgroundColor = [UIColor blackColor];
   self.contentView.backgroundColor = [UIColor blackColor];
 
+  // Views that are added last have the highest z-order.
+  [self.view addSubview:self.tabStripView];
+  [self.view addSubview:self.toolbarView];
+  [self.view addSubview:self.contentView];
+  [self.view addSubview:self.findBarView];
+  self.findBarView.hidden = YES;
+
   [self addChildViewController:self.tabStripViewController
                      toSubview:self.tabStripView];
   [self addChildViewController:self.toolbarViewController
                      toSubview:self.toolbarView];
   [self addChildViewController:self.contentViewController
                      toSubview:self.contentView];
 
   self.tabStripHeightConstraint =
       [self.tabStripView.heightAnchor constraintEqualToConstant:0.0f];
   self.toolbarHeightConstraint =
@@ skipping 11 matching lines @@
   if (self.contentViewController == contentViewController)
     return;
   if ([self isViewLoaded]) {
     [self detachChildViewController:self.contentViewController];
     [self addChildViewController:contentViewController
                        toSubview:self.contentView];
   }
   _contentViewController = contentViewController;
 }
 
+- (void)setFindBarViewController:(UIViewController*)findBarViewController {
+  if (self.findBarViewController == findBarViewController)
+    return;
+  if ([self isViewLoaded]) {
+    [self detachChildViewController:self.findBarViewController];
+    [self addChildViewController:findBarViewController
+                       toSubview:self.findBarView];
+  }
+  _findBarViewController = findBarViewController;
+  self.findBarView.hidden = (_findBarViewController == nil);
+}
+
 - (void)setToolbarViewController:(UIViewController*)toolbarViewController {
   if (self.toolbarViewController == toolbarViewController)
     return;
   if ([self isViewLoaded]) {
     [self detachChildViewController:self.toolbarViewController];
     [self addChildViewController:toolbarViewController
                        toSubview:self.toolbarView];
   }
   _toolbarViewController = toolbarViewController;
 }
@@ skipping 100 matching lines @@
 
 #pragma mark - NSObject method forwarding
 
 - (id)forwardingTargetForSelector:(SEL)aSelector {
   if (aSelector == self.actionToForward) {
     return self.forwardingTarget;
   }
   return nil;
 }
 
-#pragma mark - TabStripActions
+#pragma mark - Action handling
+
 - (void)showTabStrip:(id)sender {
   self.tabStripHeightConstraint.constant = kTabStripHeight;
   // HACK: Remove fake action.
   [[UIApplication sharedApplication] sendAction:@selector(tabStripDidShow:)
                                              to:nil
                                            from:sender
                                        forEvent:nil];
 }
 
 - (void)hideTabStrip:(id)sender {
@@ skipping 36 matching lines @@
         constraintEqualToAnchor:self.view.trailingAnchor],
     self.toolbarHeightConstraint,
     [self.contentView.topAnchor
         constraintEqualToAnchor:self.toolbarView.bottomAnchor],
     [self.contentView.leadingAnchor
         constraintEqualToAnchor:self.view.leadingAnchor],
     [self.contentView.trailingAnchor
         constraintEqualToAnchor:self.view.trailingAnchor],
     [self.contentView.bottomAnchor
         constraintEqualToAnchor:self.bottomLayoutGuide.topAnchor],
+
+    [self.findBarView.topAnchor
+        constraintEqualToAnchor:self.toolbarView.topAnchor],
+    [self.findBarView.bottomAnchor
+        constraintEqualToAnchor:self.toolbarView.bottomAnchor],
+    [self.findBarView.leadingAnchor
+        constraintEqualToAnchor:self.toolbarView.leadingAnchor],
+    [self.findBarView.trailingAnchor
+        constraintEqualToAnchor:self.toolbarView.trailingAnchor],
   ];
 }
 
 @end
 
 @implementation BottomToolbarTabViewController
 
 // Override with constraints that place the toolbar on bottom.
 - (Constraints*)subviewConstraints {
   return @[
@@ skipping 16 matching lines @@
         constraintEqualToAnchor:self.view.leadingAnchor],
     [self.toolbarView.trailingAnchor
         constraintEqualToAnchor:self.view.trailingAnchor],
     self.toolbarHeightConstraint,
     [self.toolbarView.bottomAnchor
         constraintEqualToAnchor:self.bottomLayoutGuide.topAnchor],
   ];
 }
 
 @end