[android_webview] Use auto-sizing for webviews in wrap content mode.

android_webview/java/src/org/chromium/android_webview/AwContents.java

Index: android_webview/java/src/org/chromium/android_webview/AwContents.java
diff --git a/android_webview/java/src/org/chromium/android_webview/AwContents.java b/android_webview/java/src/org/chromium/android_webview/AwContents.java
index 18ba0cca75fc4727e16cdad3210af97f00d3ef2c..1b151c57b08b8a53eb39b1bd752500d048773d7b 100644
--- a/android_webview/java/src/org/chromium/android_webview/AwContents.java
+++ b/android_webview/java/src/org/chromium/android_webview/AwContents.java
@@ -344,6 +344,11 @@ public class AwContents {
         public void setMeasuredDimension(int measuredWidth, int measuredHeight) {
             mInternalAccessAdapter.setMeasuredDimension(measuredWidth, measuredHeight);
         }
+
+        @Override
+        public void setAutoResizeMode(boolean enabled, int widthDip) {
+            nativeSetAutoResizeMode(mNativeAwContents, enabled, widthDip);
+        }
     }
 
     //--------------------------------------------------------------------------------------------
@@ -1506,6 +1511,7 @@ public class AwContents {
         if (mNativeAwContents == 0) return;
         mScrollOffsetManager.setContainerViewSize(w, h);
         mContentViewCore.onPhysicalBackingSizeChanged(w, h);
+        mLayoutSizer.onSizeChanged(w, h, ow, oh);
         mContentViewCore.onSizeChanged(w, h, ow, oh);
         nativeOnSizeChanged(mNativeAwContents, w, h, ow, oh);
     }
@@ -1906,6 +1912,9 @@ public class AwContents {
     private native void nativeSetDisplayedPageScaleFactor(int nativeAwContents,
             float pageScaleFactor);
 
+    private native void nativeSetAutoResizeMode(int nativeAwContents, boolean enabled,
+            int widthDip);
+
     // Returns null if save state fails.
     private native byte[] nativeGetOpaqueState(int nativeAwContents);