Implemented new channel switcher UI.

chrome/browser/resources/help/channel_change_page.html

Index: chrome/browser/resources/help/channel_change_page.html
diff --git a/chrome/browser/resources/help/channel_change_page.html b/chrome/browser/resources/help/channel_change_page.html
new file mode 100644
index 0000000000000000000000000000000000000000..dbdf1e81483ba4d761e943eae8ead9051d2c9ea2
--- /dev/null
+++ b/chrome/browser/resources/help/channel_change_page.html
@@ -0,0 +1,54 @@
+<div id="channel-change-page" class="page">
+  <div class="close-button"></div>
+  <div class="content-area">
+    <h3 i18n-content="channelChangePageTitle"
+        class="channel-change-page-title"></h3>
+    <div>
+      <div class="channel-change-page-channel">
+        <input id="stable" type="radio" name="channel" value="stable-channel">
+        <label for="stable" i18n-content="stable"></label>
+      </div>
+      <div class="channel-change-page-channel">
+        <input id="beta" type="radio" name="channel" value="beta-channel">
+        <label for="beta" i18n-content="beta"></label>
+      </div>
+      <div class="channel-change-page-channel">
+        <input id="dev" type="radio" name="channel" value="dev-channel">
+        <label for="dev" i18n-content="dev"></label>
+      </div>
+    </div>
+    <div class="channel-change-page-message
+                show-when-selected-channel-requires-powerwash">
+      <h3 class="channel-change-page-message-title"
+          i18n-content="channelChangePagePowerwashTitle"></h3>
+      <div i18n-content="channelChangePagePowerwashMessage"></div>
+    </div>
+    <div class="channel-change-page-message
+                show-when-selected-channel-requires-delayed-update">
+      <h3 class="channel-change-page-message-title"
+          i18n-content="channelChangePageDelayedChangeTitle"></h3>
+      <div id="channel-change-page-delayed-change-message"></div>
+    </div>
+    <div class="channel-change-page-message
+                show-when-selected-channel-unstable">
+      <h3 class="channel-change-page-message-title"
+          i18n-content="channelChangePageUnstableTitle"></h3>
+      <div id="channel-change-page-unstable-message"></div>
+    </div>
+  </div>
+  <div class="action-area">
+    <div class="button-strip">
+      <button id="channel-change-page-powerwash-button"
+          class="show-when-selected-channel-requires-powerwash"
+          i18n-content="channelChangePagePowerwashButton">

[Nikita (slow), 2013/06/21 12:21:33]

nit: Add closing tag </button>

[ygorshenin1, 2013/06/21 17:24:58]

Done.

+      <button id="channel-change-page-change-button"
+          class="show-when-selected-channel-requires-delayed-update
+                 show-when-selected-channel-good
+                 show-when-selected-channel-unstable"
+          i18n-content="channelChangePageChangeButton">
+      <button id="channel-change-page-cancel-button"
+          class="default-button"
+          i18n-content="channelChangePageCancelButton">
+    </div>
+  </div>
+</div>