Tab Search: Update button svg image

Updated screenshots:

Default view:
https://drive.google.com/file/d/1KLzsAnrQa4UomlH4HtWpUeRyhZzo315E/view

FixedEntrypoint view (guarded by chrome UI flag):
https://drive.google.com/file/d/1nHTx-GdNtOJBN6Zxp-YMh3E6zPYnXSYE/view

Bug: 1128599
Change-Id: I0db6a5400ff0cd8e5558576ec59537e0288d2b1b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2427103Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Thomas Lukaszewicz <tluk@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810997}

chrome/app/vector_icons/BUILD.gn

@@ -116,6 +116,7 @@ aggregate_vector_icons("chrome_vector_icons") {
     "tab_media_capturing.icon",
     "tab_media_capturing_with_arrow.icon",
     "tab_media_recording.icon",
+    "tab_search.icon",
     "tab_usb_connected.icon",
     "tablet.icon",
     "translate.icon",

chrome/app/vector_icons/tab_search.icon

+// Copyright 2020 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.
+
+CANVAS_DIMENSIONS, 16,
+MOVE_TO, 15, 8,
+CUBIC_TO, 15, 4.14f, 11.86f, 1, 8, 1,
+CUBIC_TO, 4.14f, 1, 1, 4.14f, 1, 8,
+CUBIC_TO, 1, 11.86f, 4.14f, 15, 8, 15,
+CUBIC_TO, 11.86f, 15, 15, 11.86f, 15, 8,
+CLOSE,
+MOVE_TO, 4.85f, 6,
+LINE_TO, 11.15f, 6,
+LINE_TO, 8, 10.8f,
+LINE_TO, 4.85f, 6,
+CLOSE

chrome/browser/ui/views/tabs/tab_search_button.cc

@@ -12,7 +12,6 @@
 #include "ui/views/widget/widget.h"
 
 namespace {
-constexpr int kIconSize = 20;
 
 TabSearchOpenAction GetActionForEvent(const ui::Event& event) {
   if (event.IsMouseEvent()) {
@@ -46,9 +45,8 @@ void TabSearchButton::FrameColorsChanged() {
   // Icon color needs to be updated here as this is called when the hosting
   // window switches between active and inactive states. In each state the
   // foreground color of the tab controls is expected to change.
-  SetImage(
-      Button::STATE_NORMAL,
-      gfx::CreateVectorIcon(kCaretDownIcon, kIconSize, GetForegroundColor()));
+  SetImage(Button::STATE_NORMAL,
+           gfx::CreateVectorIcon(kTabSearchIcon, GetForegroundColor()));
 }
 
 void TabSearchButton::ButtonPressed(views::Button* sender,