[Search] Adjust buttons in the first run experience.

Pure HTML/CSS changes. No tests affected.

BUG=413337,416228

Review URL: https://codereview.chromium.org/612823005

Cr-Commit-Position: refs/heads/master@{#297270}

chrome/app/chromium_strings.grd

@@ -1225,7 +1225,7 @@ Signing in anyway will merge Chromium information like bookmarks, history, and o
         Search with one touch
       </message>
       <message name="IDS_CONTEXTUAL_SEARCH_PROMO_DESCRIPTION_1" desc="Part 1 of the description of the Contextual Search feature. Combined with FEATURE_NAME and DESCRIPTION_2 below, the whole should be a paragraph describing the feature. This line can be empty if it makes sense to start the sentence with FEATURE_NAME.">
-        Learn about topics on websites without leaving your browser.
+        Learn about topics on websites without leaving your tab.
       </message>
       <message name="IDS_CONTEXTUAL_SEARCH_PROMO_FEATURE_NAME" desc="Name of the Contextual Search feature. See explanation in DESCRIPTION_1.">
         Tap to Search

chrome/app/google_chrome_strings.grd

@@ -1150,7 +1150,7 @@ Signing in anyway will merge Chrome information like bookmarks, history, and oth
         Search with one touch
       </message>
       <message name="IDS_CONTEXTUAL_SEARCH_PROMO_DESCRIPTION_1" desc="Part 1 of the description of the Contextual Search feature. Combined with FEATURE_NAME and DESCRIPTION_2 below, the whole should be a paragraph describing the feature. This line can be empty if it makes sense to start the sentence with FEATURE_NAME.">
-        Learn about topics on websites without leaving your browser.
+        Learn about topics on websites without leaving your tab.
       </message>
       <message name="IDS_CONTEXTUAL_SEARCH_PROMO_FEATURE_NAME" desc="Name of the Contextual Search feature. See explanation in DESCRIPTION_1.">
         Tap to Search

chrome/browser/resources/contextual_search/promo.css

@@ -16,26 +16,13 @@ body {
 }
 
 a {
-  color: #414141;
   text-decoration: none;
 }
 
-.colored {
+a.colored-link {
   color: rgb(66, 133, 244);
 }
 
-.label {
-  display: inline-block;
-  font-size: 14px;
-  font-weight: bold;
-  padding: 28px;
-  white-space: nowrap;
-}
-
-.label a {
-  text-transform: uppercase;
-}
-
 #button-container {
   text-align: right;
   width: 100%;
@@ -66,3 +53,33 @@ a {
   height: 100px;
   margin: 0 auto 24px auto;
 }
+
+.label {
+  display: inline-block;
+  font-size: 14px;
+  margin: 14px 0;
+  /* We use a slightly different top-bottom padding because Roboto has a
+     rendering bug which makes an extra padding to be rendered at the bottom of
+     text. */
+  padding: 17px 14px 13px 14px;
+  white-space: nowrap;
+}
+
+.label a {
+  text-transform: uppercase;
+}
+
+#optin-label {
+  background: rgb(66, 133, 244);
+  background-clip: padding-box;
+  border-radius: 3px;
+  margin-right: 24px;
+}
+
+#optin-label a {
+  color: white;
+}
+
+#optout-label a {
+  color: rgb(66, 133, 244);
+}

chrome/browser/resources/contextual_search/promo.html

@@ -17,12 +17,12 @@
     <p i18n-content="heading" id="heading"></p>
     <p id="description">
       <span i18n-content="description-1"></span>
-      <a class="colored" href="#learn-more" i18n-content="feature-name"></a>
+      <a class="colored-link" href="#learn-more" i18n-content="feature-name"></a>
       <span i18n-content="description-2"></span>
     </p>
     <div id="button-container">
-      <span class="label"><a href="#optout" i18n-content="optOut"></a></span>
-      <span id="optin-label" class="label"><a class="colored" href="#optin" i18n-content="optIn"></a></span>
+      <span id="optout-label" class="label"><a href="#optout" i18n-content="optOut"></a></span>
+      <span id="optin-label" class="label"><a href="#optin" i18n-content="optIn"></a></span>
     </div>
   </div>
 </body>