Add PhysicalWebBroadcastService

chrome/android/java/src/org/chromium/chrome/browser/physicalweb/PhysicalWebShareActivity.java

Index: chrome/android/java/src/org/chromium/chrome/browser/physicalweb/PhysicalWebShareActivity.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/physicalweb/PhysicalWebShareActivity.java b/chrome/android/java/src/org/chromium/chrome/browser/physicalweb/PhysicalWebShareActivity.java
index 5fe13a3583fad9cb49531491e2635c90823778b5..0261a1d93c503260a47d99ab475f7c197f62e1a5 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/physicalweb/PhysicalWebShareActivity.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/physicalweb/PhysicalWebShareActivity.java
@@ -4,15 +4,20 @@
 
 package org.chromium.chrome.browser.physicalweb;
 
+import android.app.Activity;
 import android.content.Intent;
 import android.os.Build;
 import android.os.Bundle;
 import android.support.v7.app.AppCompatActivity;
 
+import org.chromium.base.ApplicationStatus;
+import org.chromium.chrome.browser.ChromeActivity;
 import org.chromium.chrome.browser.share.ShareHelper;
 import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.chrome.browser.util.IntentUtils;
 
+import java.lang.ref.WeakReference;
+import java.util.List;
 /**
  * A simple activity that allows Chrome to start the physical web sharing service.
  */
@@ -35,10 +40,43 @@ public class PhysicalWebShareActivity extends AppCompatActivity {
     }
 
     private void handleShareAction() {
-        // TODO(iankc): implement sharing
+        ChromeActivity openPage = getTriggeringActivity();
+        if (openPage == null) return;
+        String url = openPage.getActivityTab().getUrl();
+
+        Intent intent = new Intent(this, PhysicalWebBroadcastService.class);
+        intent.putExtra(PhysicalWebBroadcastService.DISPLAY_URL_KEY, url);
+        startService(intent);
     }
 
+    /**
+     * Pre-conditions for Physical Web Sharing to be enabled:
+     *      Device has hardware BLE advertising capabilities.
+     *      Device is Marshmallow or above.
+     *      Device has sharing feature enabled.
+     */
     public static boolean sharingIsEnabled(Tab currentTab) {
         return PhysicalWeb.sharingIsEnabled() && Build.VERSION.SDK_INT >= Build.VERSION_CODES.M;
     }
+
+    /**
+     * Returns the ChromeActivity that called the share intent picker.
+     */
+    protected ChromeActivity getTriggeringActivity() {

[cco3, 2017/03/02 19:01:08]

Since we don't have an abstract class, could we turn this into a static method
that belongs to ShareHelper.java (or one of those classes) and takes an Intent?

+        int triggeringTaskId =
+                IntentUtils.safeGetIntExtra(getIntent(), ShareHelper.EXTRA_TASK_ID, 0);
+        List<WeakReference<Activity>> activities = ApplicationStatus.getRunningActivities();
+        ChromeActivity triggeringActivity = null;
+        for (int i = 0; i < activities.size(); i++) {
+            Activity activity = activities.get(i).get();
+            if (activity == null) continue;
+
+            // Since the share intent is triggered without NEW_TASK or NEW_DOCUMENT, the task ID
+            // of this activity will match that of the triggering activity.
+            if (activity.getTaskId() == triggeringTaskId && activity instanceof ChromeActivity) {
+                return (ChromeActivity) activity;
+            }
+        }
+        return null;
+    }
 }