[sensors] Add Permission guard to the generic sensor apis.

chrome/app/theme/theme_resources.grd

Index: chrome/app/theme/theme_resources.grd
diff --git a/chrome/app/theme/theme_resources.grd b/chrome/app/theme/theme_resources.grd
index cc5eed6e26408c37126e96fdd275166d89c15adb..123ad97a17f47d1c0af2a61d43539dcc217917f7 100644
--- a/chrome/app/theme/theme_resources.grd
+++ b/chrome/app/theme/theme_resources.grd
@@ -36,6 +36,9 @@
       <structure type="chrome_scaled_image" name="IDR_ALLOWED_LOCATION" file="common/allowed_location.png" />
       <structure type="chrome_scaled_image" name="IDR_ALLOWED_MIC" file="common/allowed_mic.png" />
       <structure type="chrome_scaled_image" name="IDR_ALLOWED_MIDI_SYSEX" file="common/allowed_midi.png" />
+      <!-- TODO(riju)
+      -->
+      <structure type="chrome_scaled_image" name="IDR_ALLOWED_SENSORS" file="common/allowed_midi.png" />
       <structure type="chrome_scaled_image" name="IDR_ALLOWED_MOUSE_CURSOR" file="common/allowed_mouse_cursor.png" />
       <structure type="chrome_scaled_image" name="IDR_ALLOWED_NOTIFICATION" file="common/allowed_notifications.png" />
       <if expr="enable_plugins">
@@ -91,6 +94,9 @@
       <structure type="chrome_scaled_image" name="IDR_BLOCKED_LOCATION" file="common/blocked_location.png" />
       <structure type="chrome_scaled_image" name="IDR_BLOCKED_MIC" file="common/blocked_mic.png" />
       <structure type="chrome_scaled_image" name="IDR_BLOCKED_MIDI_SYSEX" file="common/blocked_midi.png" />
+      <!--TODO(riju): Use sensors png when ready
+      -->
+      <structure type="chrome_scaled_image" name="IDR_BLOCKED_SENSORS" file="common/blocked_midi.png" />
       <structure type="chrome_scaled_image" name="IDR_BLOCKED_MOUSE_CURSOR" file="common/blocked_mouse_cursor.png" />
       <structure type="chrome_scaled_image" name="IDR_BLOCKED_NOTIFICATION" file="common/blocked_notifications.png" />
       <if expr="enable_plugins">