Extract common HTML from oobe.html/login.html.

chrome/browser/resources/chromeos/login/screen_container.html

Index: chrome/browser/resources/chromeos/login/screen_container.html
diff --git a/chrome/browser/resources/chromeos/login/screen_container.html b/chrome/browser/resources/chromeos/login/screen_container.html
new file mode 100644
index 0000000000000000000000000000000000000000..216d34dc7f2ebcf44a3dd5b581a4267b7533828e
--- /dev/null
+++ b/chrome/browser/resources/chromeos/login/screen_container.html
@@ -0,0 +1,18 @@
+<div id="background" class="background-initial"></div>
+<include src="version.html">
+<div id="outer-container">
+  <div id="oobe" class="faded">
+    <div id="inner-container" class="down">
+      <div id="step-logo" hidden>
+	<img src="chrome://theme/IDR_PRODUCT_LOGO" alt="">

[Nikita (slow), 2013/04/18 09:29:40]

nit: alt attribute could be dropped

[dzhioev (left Google), 2013/04/18 09:33:30]

No, alt attribute is required for img in html5. But you can simply use empty
attribute <img alt ... > instead of <img alt="">.

[Nikita (slow), 2013/04/18 09:36:55]

Thanks for clarification.

[dconnelly, 2013/04/18 12:50:47]

Done.

+	<div id="header-sections">
+	</div>
+      </div>
+      <include src="oobe_screens.html">
+    </div>
+    <div id="progress-dots" class="down"></div>
+  </div>
+</div>
+<div id="bubble" class="bubble faded" hidden></div>
+<include src="header_bar.html">
+<include src="user_pod_template.html">