Bug 1396951 - 3. Move GeckoAppShell.viewSizeChanged() to GeckoLayerClient; r=rbarker

Let `GeckoLayerClient` directly deal with scroll-to-input on resize,
instead of going through `GeckoAppShell` and relying on
`getLayerView()`. This is a necessary fix to let us remove
`getLayerView()`, and in a follow-up bug we should actually fix
scroll-to-input to work on any GeckoView.

MozReview-Commit-ID: 1xsHh2vg08M

--HG--
extra : rebase_source : 3061623d3ed0309fff42c6dc66d0246e1d3000a3

mobile/android/geckoview/src/main/java/org/mozilla/gecko/GeckoAppShell.java

@@ -1584,21 +1584,6 @@ public class GeckoAppShell
         return HardwareUtils.isTablet();
     }
 
-    private static boolean sImeWasEnabledOnLastResize = false;
-    public static void viewSizeChanged() {
-        GeckoView v = (GeckoView) getLayerView();
-        if (v == null) {
-            return;
-        }
-        boolean imeIsEnabled = v.isIMEEnabled();
-        if (imeIsEnabled && !sImeWasEnabledOnLastResize) {
-            // The IME just came up after not being up, so let's scroll
-            // to the focused input.
-            EventDispatcher.getInstance().dispatch("ScrollTo:FocusedInput", null);
-        }
-        sImeWasEnabledOnLastResize = imeIsEnabled;
-    }
-
     @WrapForJNI(calledFrom = "gecko")
     private static double[] getCurrentNetworkInformation() {
         return GeckoNetworkManager.getInstance().getCurrentInformation();

mobile/android/geckoview/src/main/java/org/mozilla/gecko/GeckoView.java

@@ -751,7 +751,8 @@ public class GeckoView extends LayerView {
                 mInputConnectionListener.onKeyMultiple(keyCode, repeatCount, event);
     }
 
-    /* package */ boolean isIMEEnabled() {
+    @Override
+    public boolean isIMEEnabled() {
         return mInputConnectionListener != null &&
                 mInputConnectionListener.isIMEEnabled();
     }

mobile/android/geckoview/src/main/java/org/mozilla/gecko/gfx/GeckoLayerClient.java

@@ -33,6 +33,7 @@ class GeckoLayerClient implements LayerView.Listener
     private IntSize mWindowSize;
 
     private boolean mForceRedraw;
+    private boolean mImeWasEnabledOnLastResize;
 
     /* The current viewport metrics.
      * This is volatile so that we can read and write to it from different threads.
@@ -153,7 +154,13 @@ class GeckoLayerClient implements LayerView.Listener
             // the following call also sends gecko a message, which will be processed after the resize
             // message above has updated the viewport. this message ensures that if we have just put
             // focus in a text field, we scroll the content so that the text field is in view.
-            GeckoAppShell.viewSizeChanged();
+            final boolean imeIsEnabled = mView.isIMEEnabled();
+            if (imeIsEnabled && !mImeWasEnabledOnLastResize) {
+                // The IME just came up after not being up, so let's scroll
+                // to the focused input.
+                EventDispatcher.getInstance().dispatch("ScrollTo:FocusedInput", null);
+            }
+            mImeWasEnabledOnLastResize = imeIsEnabled;
         }
         return true;
     }

mobile/android/geckoview/src/main/java/org/mozilla/gecko/gfx/LayerView.java

@@ -824,5 +824,9 @@ public class LayerView extends FrameLayout {
         if (isCompositorReady()) {
             mCompositor.setDefaultClearColor(mDefaultClearColor);
         }
-   }
+    }
+
+    public boolean isIMEEnabled() {
+        return false;
+    }
 }