Revert change to setInitialScale() to take display density into account.

Updated WebView documentation to clarify this behavior.

Additionally, if target-densityDpi is specified in the meta viewport
tag, update the display density in ZoomManager.

Bug: 5477652
Bug: 5327492
Change-Id: I176e87489f76a2ee6595d76a006e302b07595de1

Author: mghiware

core/java/android/webkit/WebSettings.java

@@ -799,7 +799,7 @@ public int getDoubleTapZoom() {
     public void setDefaultZoom(ZoomDensity zoom) {
         if (mDefaultZoom != zoom) {
             mDefaultZoom = zoom;
-            mWebView.updateDefaultZoomDensity(zoom.value);
+            mWebView.adjustDefaultZoomDensity(zoom.value);
         }
     }
 

core/java/android/webkit/WebView.java

@@ -1341,9 +1341,13 @@ public void setOverScrollMode(int mode) {
         }
     }
 
-    /* package */void updateDefaultZoomDensity(int zoomDensity) {
+    /* package */ void adjustDefaultZoomDensity(int zoomDensity) {
         final float density = mContext.getResources().getDisplayMetrics().density
                 * 100 / zoomDensity;
+        updateDefaultZoomDensity(density);
+    }
+
+    /* package */ void updateDefaultZoomDensity(float density) {
         mNavSlop = (int) (16 * density);
         mZoomManager.updateDefaultZoomDensity(density);
     }
@@ -2469,7 +2473,9 @@ public float getScale() {
      * Set the initial scale for the WebView. 0 means default. If
      * {@link WebSettings#getUseWideViewPort()} is true, it zooms out all the
      * way. Otherwise it starts with 100%. If initial scale is greater than 0,
-     * WebView starts will this value as initial scale.
+     * WebView starts with this value as initial scale.
+     * Please note that unlike the scale properties in the viewport meta tag,
+     * this method doesn't take the screen density into account.
      *
      * @param scaleInPercent The initial scale in percent.
      */

core/java/android/webkit/WebViewCore.java

@@ -2336,6 +2336,9 @@ private void setupViewport(boolean updateViewState) {
             adjust = (float) mContext.getResources().getDisplayMetrics().densityDpi
                     / mViewportDensityDpi;
         }
+        if (adjust != mWebView.getDefaultZoomScale()) {
+            mWebView.updateDefaultZoomDensity(adjust);
+        }
         int defaultScale = (int) (adjust * 100);
 
         if (mViewportInitialScale > 0) {
@@ -2546,7 +2549,7 @@ private void setupViewport(boolean updateViewState) {
     // called by JNI
     private void restoreScale(float scale, float textWrapScale) {
         if (mBrowserFrame.firstLayoutDone() == false) {
-            mIsRestored = scale > 0;
+            mIsRestored = true;
             mRestoredScale = scale;
             if (mSettings.getUseWideViewPort()) {
                 mRestoredTextWrapScale = textWrapScale;

core/java/android/webkit/ZoomManager.java

@@ -349,7 +349,7 @@ public final void setZoomCenter(float x, float y) {
     }
 
     public final void setInitialScaleInPercent(int scaleInPercent) {
-        mInitialScale = scaleInPercent * mDisplayDensity * 0.01f;
+        mInitialScale = scaleInPercent * 0.01f;
     }
 
     public final float computeScaleWithLimits(float scale) {