Resize only the virtual viewport when the OSK triggers a resize.

chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java

Index: chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java b/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
index f5555ba00fde36175d9809637a8d88ab294a6536..41f0fc536a879a6f7e6320e4bb672a4dd92edee4 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
@@ -431,6 +431,42 @@ public final class Tab implements ViewGroup.OnHierarchyChangeListener,
         }
 
         @Override
+        public int getSystemWindowInsetLeft() {

[Ted C, 2016/03/12 00:01:44]

instead of having 4 methods, I wonder if we should add an interface like
SystemWindowInsetProvider that the InsetConsumerView would implement.

Then there would only be one method in ContentViewClient
(getSystemWindowInsetProvider).

Thoughts?

+            ChromeActivity activity = getActivity();
+            if (activity != null && activity.getInsetConsumerView() != null) {

[Ted C, 2016/03/12 00:01:44]

As far as I can tell from your patch, the inset consumer can't be null as long
as the activity isn't so that seems to be unnecessary

+                return activity.getInsetConsumerView().getSystemWindowInsetsLeft();
+            }
+            return 0;
+        }
+
+        @Override
+        public int getSystemWindowInsetTop() {
+            ChromeActivity activity = getActivity();
+            if (activity != null && activity.getInsetConsumerView() != null) {
+                return activity.getInsetConsumerView().getSystemWindowInsetsTop();
+            }
+            return 0;
+        }
+
+        @Override
+        public int getSystemWindowInsetRight() {
+            ChromeActivity activity = getActivity();
+            if (activity != null && activity.getInsetConsumerView() != null) {
+                return activity.getInsetConsumerView().getSystemWindowInsetsRight();
+            }
+            return 0;
+        }
+
+        @Override
+        public int getSystemWindowInsetBottom() {
+            ChromeActivity activity = getActivity();
+            if (activity != null && activity.getInsetConsumerView() != null) {
+                return activity.getInsetConsumerView().getSystemWindowInsetsBottom();
+            }
+            return 0;
+        }
+
+        @Override
         public ContentVideoViewEmbedder getContentVideoViewEmbedder() {
             return new ActivityContentVideoViewEmbedder(getActivity()) {
                 @Override