Fix errorprone ReferenceEquality warnings

Fix errorprone ReferenceEquality warnings and make
sure it is treated as error after this CL.

http://errorprone.info/bugpattern/ReferenceEquality

Bug: 802075

Change-Id: Icd9d0ccd0f625b1eef1d92d88600641b67a8587a
Reviewed-on: https://chromium-review.googlesource.com/911609Reviewed-by: Min Qin <qinmin@chromium.org>
Reviewed-by: Helen Li <xunjieli@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Commit-Queue: Rob Buis <rob.buis@samsung.com>
Cr-Commit-Position: refs/heads/master@{#543225}

build/android/gyp/javac.py

@@ -25,8 +25,6 @@ ERRORPRONE_WARNINGS_TO_TURN_OFF = [
   'SynchronizeOnNonFinalField',
   # TODO(crbug.com/802073): Follow steps in bug.
   'TypeParameterUnusedInFormals',
-  # TODO(crbug.com/802075): Follow steps in bug.
-  'ReferenceEquality',
   # TODO(crbug.com/803484): Follow steps in bug.
   'CatchFail',
   # TODO(crbug.com/803485): Follow steps in bug.
@@ -99,6 +97,7 @@ ERRORPRONE_WARNINGS_TO_ERROR = [
   'StaticGuardedByInstance',
   'StaticQualifiedUsingExpression',
   'UseCorrectAssertInTests',
+  'ReferenceEquality',
 ]
 
 

chrome/android/java/src/org/chromium/chrome/browser/media/ui/MediaNotificationInfo.java

@@ -295,6 +295,7 @@ public class MediaNotificationInfo {
     }
 
     @Override
+    @SuppressWarnings("ReferenceEquality")
     public boolean equals(Object obj) {
         if (obj == this) return true;
         if (!(obj instanceof MediaNotificationInfo)) return false;

chrome/android/java/src/org/chromium/chrome/browser/omnibox/LocationBarLayout.java

@@ -1777,8 +1777,9 @@ public class LocationBarLayout extends FrameLayout
      * @param skipCheck Whether to skip an out of bounds check.
      * @return The url to navigate to.
      */
-    private String updateSuggestionUrlIfNeeded(OmniboxSuggestion suggestion, int selectedIndex,
-            boolean skipCheck) {
+    @SuppressWarnings("ReferenceEquality")
+    private String updateSuggestionUrlIfNeeded(
+            OmniboxSuggestion suggestion, int selectedIndex, boolean skipCheck) {
         // Only called once we have suggestions, and don't have a listener though which we can
         // receive suggestions until the native side is ready, so this is safe
         assert mNativeInitialized

chrome/android/java/src/org/chromium/chrome/browser/preferences/password/SavePasswordsPreferences.java

@@ -322,7 +322,7 @@ public class SavePasswordsPreferences
 
         // Constructs the successful result: a valid URI and no error.
         public ExportResult(Uri uri) {
-            assert uri != null && uri != Uri.EMPTY;
+            assert uri != null && !uri.equals(Uri.EMPTY);
             mUri = uri;
             mError = null;
         }
@@ -624,7 +624,7 @@ public class SavePasswordsPreferences
         assert mExportState == EXPORT_STATE_CONFIRMED;
         mExportState = EXPORT_STATE_INACTIVE;
 
-        if (mExportFileUri == Uri.EMPTY) return;
+        if (mExportFileUri.equals(Uri.EMPTY)) return;
 
         Intent send = new Intent(Intent.ACTION_SEND);
         send.setType("text/csv");

chrome/android/java/src/org/chromium/chrome/browser/signin/AccountSigninView.java

@@ -886,8 +886,7 @@ public class AccountSigninView extends FrameLayout {
                           + "by setText() or setTextNonRecordable().";
 
         // Ensure that the text hasn't changed since the assignment.
-        assert view.getText().toString()
-                == metadata.getString()
+        assert view.getText().toString().equals(metadata.getString())
             : "The text '"
                 + view.getText().toString()
                 + "' has been modified after it was assigned by setText() "

components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/OfflineItem.java

@@ -45,6 +45,7 @@ public class OfflineItem {
         }
 
         @Override
+        @SuppressWarnings("ReferenceEquality")
         public boolean equals(Object obj) {
             if (obj instanceof Progress) {
                 Progress other = (Progress) obj;

media/capture/video/android/java/src/org/chromium/media/VideoCaptureCamera.java

@@ -598,8 +598,8 @@ public class VideoCaptureCamera
         if (flashModes != null) {
             builder.setSupportsTorch(
                     flashModes.contains(android.hardware.Camera.Parameters.FLASH_MODE_TORCH));
-            builder.setTorch(parameters.getFlashMode()
-                    == android.hardware.Camera.Parameters.FLASH_MODE_TORCH);
+            builder.setTorch(android.hardware.Camera.Parameters.FLASH_MODE_TORCH.equals(
+                    parameters.getFlashMode()));
 
             builder.setRedEyeReduction(
                     flashModes.contains(android.hardware.Camera.Parameters.FLASH_MODE_RED_EYE));

net/android/javatests/src/org/chromium/net/AndroidProxySelectorTest.java

@@ -47,7 +47,7 @@ public class AndroidProxySelectorTest {
     }
 
     static String toString(Proxy proxy) {
-        if (proxy == Proxy.NO_PROXY) return "DIRECT";
+        if (proxy.equals(Proxy.NO_PROXY)) return "DIRECT";
         // java.net.Proxy only knows about http and socks proxies.
         Proxy.Type type = proxy.type();
         switch (type) {