Pass width/height parameters to webview

When webview draws into an fbo layer, it needs to know the
size of that surface to create the rendering transform appropriately.
This change copies in the current viewport size to the structure that
is passed to the webview.

Change-Id: I7160b0836d00834134c799c95a439cdc045e2035

include/private/hwui/DrawGlInfo.h

@@ -31,6 +31,10 @@ struct DrawGlInfo {
     int clipRight;
     int clipBottom;
 
+    // Input: current width/height of destination surface
+    int width;
+    int height;
+
     // Input: is the render target an FBO
     bool isLayer;
 

libs/hwui/OpenGLRenderer.cpp

@@ -249,6 +249,8 @@ status_t OpenGLRenderer::invokeFunctors(Rect& dirty) {
     info.clipRight = 0;
     info.clipBottom = 0;
     info.isLayer = false;
+    info.width = 0;
+    info.height = 0;
     memset(info.transform, 0, sizeof(float) * 16);
 
     size_t count = functors.size();
@@ -292,6 +294,8 @@ status_t OpenGLRenderer::callDrawGLFunction(Functor* functor, Rect& dirty) {
     info.clipRight = clip.right;
     info.clipBottom = clip.bottom;
     info.isLayer = hasLayer();
+    info.width = getSnapshot()->viewport.getWidth();
+    info.height = getSnapshot()->height;
     getSnapshot()->transform->copyTo(&info.transform[0]);
 
     status_t result = (*functor)(DrawGlInfo::kModeDraw, &info);