Adds a ChromeSamples.clearLog() method and updates the Bluetooth samples to use it

SAMPLE_STARTING_POINT/index.html

@@ -12,21 +12,21 @@ additional_head_content: <meta name="optional" value="optional">
 <p>Any content here, outside of a capture block, is included verbatim on the resulting page.</p>
 
 {% capture initial_output_content %}
-<p>This can be used to set initial sample output.</p>
+<p>This optional capture/include can be used to set initial sample output.</p>
 {% endcapture %}
 {% include output_helper.html initial_output_content=initial_output_content %}
 
 {% capture js %}
 /*
-  Use this section for any JavaScript that shows off the feature's functionality.
+  Use this optional capture/include for any JavaScript that shows off the feature's functionality.
   Do not surround it with &lt;script> tags.
   If output_helper.html is included on this page, then ChromeSamples.log(),
-  ChromeSamples.setStatus(), and ChromeSamples.setContent() can be used here.
+  ChromeSamples.clearLog(), ChromeSamples.setStatus(), and ChromeSamples.setContent() can be used.
 */
 {% endcapture %}
 {% include js_snippet.html js=js %}
 
 {% capture css %}
-/* Use this section for CSS that shows off the feature's functionality. */
+/* Use this optional capture/include for CSS that shows off the feature's functionality. */
 {% endcapture %}
 {% include css_snippet.html css=css %}

_includes/output_helper.html

@@ -8,6 +8,10 @@
       document.querySelector('#log').textContent += line + '\n';
     },
 
+    clearLog: function() {
+      document.querySelector('#log').textContent = '';
+    },
+
     setStatus: function(status) {
       document.querySelector('#status').textContent = status;
     },

web-bluetooth/battery-level.html

@@ -57,14 +57,14 @@ function onButtonClick() {
 {% include js_snippet.html js=js %}
 
 <script>
-document.querySelector('button').addEventListener('click', function() {
-  document.querySelector('#log').textContent = '';
-  if (!navigator.bluetooth) {
-    log('Web Bluetooth API is not available.');
-    log('Please make sure you run Chrome OS M45 and the Web Bluetooth flag is enabled.');
-  } else {
-    onButtonClick();
-  }
-});
-log = ChromeSamples.log;
+  document.querySelector('button').addEventListener('click', function() {
+    if (!navigator.bluetooth) {
+      ChromeSamples.setStatus('Web Bluetooth API is not available.\n' +
+        'Please make sure you run Chrome OS M45 and the Web Bluetooth flag is enabled.');
+    } else {
+      ChromeSamples.clearLog();
+      onButtonClick();
+    }
+  });
+  log = ChromeSamples.log;
 </script>

web-bluetooth/device-info.html

@@ -34,14 +34,14 @@ function onButtonClick() {
 {% include js_snippet.html js=js %}
 
 <script>
-document.querySelector('button').addEventListener('click', function() {
-  document.querySelector('#log').textContent = '';
-  if (!navigator.bluetooth) {
-    log('Web Bluetooth API is not available.');
-    log('Please make sure you run Chrome OS M45 and the Web Bluetooth flag is enabled.');
-  } else {
-    onButtonClick();
-  }
-});
-log = ChromeSamples.log;
+  document.querySelector('button').addEventListener('click', function() {
+    if (!navigator.bluetooth) {
+      ChromeSamples.setStatus('Web Bluetooth API is not available.\n' +
+        'Please make sure you run Chrome OS M45 and the Web Bluetooth flag is enabled.');
+    } else {
+      ChromeSamples.clearLog();
+      onButtonClick();
+    }
+  });
+  log = ChromeSamples.log;
 </script>

web-bluetooth/reset-energy.html

@@ -58,14 +58,14 @@ function onButtonClick() {
 {% include js_snippet.html js=js %}
 
 <script>
-document.querySelector('button').addEventListener('click', function() {
-  document.querySelector('#log').textContent = '';
-  if (!navigator.bluetooth) {
-    log('Web Bluetooth API is not available.');
-    log('Please make sure you run Chrome OS M45 and the Web Bluetooth flag is enabled.');
-  } else {
-    onButtonClick();
-  }
-});
-log = ChromeSamples.log;
+  document.querySelector('button').addEventListener('click', function() {
+    if (!navigator.bluetooth) {
+      ChromeSamples.setStatus('Web Bluetooth API is not available.\n' +
+        'Please make sure you run Chrome OS M45 and the Web Bluetooth flag is enabled.');
+    } else {
+      ChromeSamples.clearLog();
+      onButtonClick();
+    }
+  });
+  log = ChromeSamples.log;
 </script>