[SalesForce] Using Detail Page Buttons with Salesforce Lightning Experience

After a day of searching, I wasn't able to come up with an easy answer, so I implemented a work-around. I wrapped my Lightning component in a VisualForce page and overrode the content source for the New and Edit actions to use the new host page. Using Lightning within a VisualForce page takes some work. See the link below to get started.

Use Lightning Components in Visualforce Pages

Here's the code I wrote to get things working. One issue I'm still researching is getting the force:* events (ex: force:showToast and force:navigateToObjectHome) to fire correctly. I added them as a dependency with no luck.

Host.page

<apex:page standardcontroller="CallReport__c">
    <!-- This page is a host page for the call report lightning component. -->
    <apex:includeLightning />

    <div class="slds">
        <div class="slds-grid slds-grid--align-center slds-p-around--small">
            <div class="slds-large-size--3-of-12"></div>

            <div class="slds-size--1-of-1 slds-large-size--6-of-12">
                <div id="callReport"></div>         
            </div>

            <div class="slds-large-size--3-of-12"></div>
        </div>
    </div>

    <script>
        var recordId = '{!callreport__c.id}';

        // c:callReport implements force:hasRecordId and requires the call report ID
        $Lightning.use("c:DepApp", function() {
          $Lightning.createComponent('c:callReport',
              { recordId : recordId },
              'callReport',
              function(cmp) {
                // do some stuff
              });
        });
    </script>
</apex:page>

DepApp.app

<aura:application access="GLOBAL" extends="ltng:outApp">
    <aura:dependency resource="c:callReport"/>
    <aura:dependency resource="markup://force:*" type="EVENT"/>
</aura:application>

You need to add the Google Info custom button from the Salesforce1 & Lightning Actions bucket to the Salesforce1 & Lightning Actions section in the layout for it to appear in the Lightning Experience view of the page.

If you just move it to the Custom Buttons section (bottom part of the above screenshot), it shows in Salesforce classic view only.

In your screenshot, you added the button to the Detail page, so it shows in Classic only. Add the button to the Salesforce1 and Lightning Experience Actions section just above it.