Enabling sampling of UMA and crash reports on Android.

chrome/android/java/src/org/chromium/chrome/browser/crash/MinidumpUploadCallable.java

Index: chrome/android/java/src/org/chromium/chrome/browser/crash/MinidumpUploadCallable.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/crash/MinidumpUploadCallable.java b/chrome/android/java/src/org/chromium/chrome/browser/crash/MinidumpUploadCallable.java
index d21a02a6553a98b47f7835c725a31586d9081a56..01b0aa10566e898bbd87ab90f66ad52d08a82095 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/crash/MinidumpUploadCallable.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/crash/MinidumpUploadCallable.java
@@ -56,13 +56,15 @@ public class MinidumpUploadCallable implements Callable<Integer> {
         UPLOAD_SUCCESS,
         UPLOAD_FAILURE,
         UPLOAD_USER_DISABLED,
-        UPLOAD_COMMANDLINE_DISABLED
+        UPLOAD_COMMANDLINE_DISABLED,
+        UPLOAD_DISABLED_BY_SAMPLING
     })
     public @interface MinidumpUploadStatus {}
     public static final int UPLOAD_SUCCESS = 0;
     public static final int UPLOAD_FAILURE = 1;
     public static final int UPLOAD_USER_DISABLED = 2;
     public static final int UPLOAD_COMMANDLINE_DISABLED = 3;
+    public static final int UPLOAD_DISABLED_BY_SAMPLING = 4;
 
     private final File mFileToUpload;
     private final File mLogfile;
@@ -102,6 +104,13 @@ public class MinidumpUploadCallable implements Callable<Integer> {
                 return UPLOAD_USER_DISABLED;
             }
 
+            if (!mPermManager.isClientInMetricsSample()) {
+                Log.i(TAG, "Minidump upload skipped due to sampling.  Marking file as uploaded for "
+                                + "cleanup to prevent future uploads.");
+                cleanupMinidumpFile();
+                return UPLOAD_DISABLED_BY_SAMPLING;
+            }
+
             boolean isLimited = mPermManager.isUploadLimited();
             if (isLimited || !mPermManager.isUploadPermitted()) {
                 Log.i(TAG, "Minidump cannot currently be uploaded due to constraints.");