Added resources needed for the pairing UI.

List of added resources:
* PNG illustation (1x and 2x).
* Three styles of Roboto font.
* SVG icon.

optimize-png-files.sh was applied to added PNG files.
Icon was not added to 'chrome_unscaled_resources.grd' because it will be inlined
to HTML.

BUG=375191

Review URL: https://codereview.chromium.org/607473004

Cr-Commit-Position: refs/heads/master@{#296987}

chrome/app/theme/cast_icon.svg

+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 17.1.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="48px"
+	 height="48px" viewBox="0 0 48 48" enable-background="new 0 0 48 48" xml:space="preserve">
+<g id="Header">
+	<g>
+		<rect x="-838" y="-440" fill="none" width="1400" height="3600"/>
+	</g>
+</g>
+<g id="Label">
+</g>
+<g id="Icon">
+	<g>
+		<g>
+			<g opacity="0.1">
+				<rect fill="none" width="48" height="48"/>
+			</g>
+			<g>
+				<rect fill="none" width="48" height="48"/>
+			</g>
+		</g>
+		<path d="M42,6H6c-2.2,0-4,1.8-4,4v6h4v-6h36v28H28v4h14c2.2,0,4-1.8,4-4V10C46,7.8,44.2,6,42,6z M2,36v6h6C8,38.7,5.3,36,2,36z
+			 M2,28v4c5.5,0,10,4.5,10,10h4C16,34.3,9.7,28,2,28z M2,20v4c9.9,0,18,8.1,18,18h4C24,29.8,14.1,20,2,20z"/>
+	</g>
+</g>
+<g id="Grid" display="none">
+	<g display="inline">
+		<line fill="none" stroke="#00E5FF" stroke-width="0.1" stroke-miterlimit="10" x1="42" y1="-440" x2="42" y2="3112"/>
+	</g>
+</g>
+</svg>

chrome/app/theme/chrome_unscaled_resources.grd

@@ -114,6 +114,11 @@
         <include name="IDR_APPS_FOLDER_OVERLAY_128" file="mac/apps_folder_overlay_128.png" type="BINDATA" />
         <include name="IDR_APPS_FOLDER_OVERLAY_512" file="mac/apps_folder_overlay_512.png" type="BINDATA" />
       </if>
+      <if expr="chromeos">
+        <include name="IDR_FONT_ROBOTO_THIN" file="Roboto-Thin.ttf" type="BINDATA" />
+        <include name="IDR_FONT_ROBOTO_LIGHT" file="Roboto-Light.ttf" type="BINDATA" />
+        <include name="IDR_FONT_ROBOTO_BOLD" file="Roboto-Bold.ttf" type="BINDATA" />
+      </if>
     </includes>
   </release>
 </grit>

chrome/app/theme/theme_resources.grd

@@ -144,6 +144,9 @@
       <structure type="chrome_scaled_image" name="IDR_BROWSER_ACTIONS_OVERFLOW" file="common/browser_actions_overflow_normal.png" />
       <structure type="chrome_scaled_image" name="IDR_BROWSER_ACTIONS_OVERFLOW_H" file="common/browser_actions_overflow_hover.png" />
       <structure type="chrome_scaled_image" name="IDR_BROWSER_ACTIONS_OVERFLOW_P" file="common/browser_actions_overflow_pressed.png" />
+      <if expr="chromeos">
+        <structure type="chrome_scaled_image" name="IDR_BUILDINGS_ILLUSTRATION" file="cros/buildings_illustration.png" />
+      </if>
       <structure type="chrome_scaled_image" name="IDR_CHEVRON_LEFT" file="common/chevron_left.png" />
       <structure type="chrome_scaled_image" name="IDR_CLOSE_BUTTON_MASK" file="common/close_button_mask.png" />
       <if expr="is_win">