Clobber frame_data->device_scale_factor to 1 on Android.

android_webview/browser/hardware_renderer.cc

Index: android_webview/browser/hardware_renderer.cc
diff --git a/android_webview/browser/hardware_renderer.cc b/android_webview/browser/hardware_renderer.cc
index 1669d7fe75e726b1d59166a1200f5ea35fc505be..d83e94332b08b03366e43d5f1454e8be48e43c15 100644
--- a/android_webview/browser/hardware_renderer.cc
+++ b/android_webview/browser/hardware_renderer.cc
@@ -154,6 +154,13 @@ bool HardwareRenderer::DrawGL(bool stencil_enabled,
     DCHECK(!input->frame.gl_frame_data);
     DCHECK(!input->frame.software_frame_data);
 
+    // DelegatedRendererLayerImpl applies the inverse device_scale_factor of the
+    // renderer frame, assuming that the browser compositor will scale
+    // it back up to device scale.  But on Android we put our browser layers in
+    // physical pixels and set our browser CC device_scale_factor to 1, so this
+    // suppresses the transform.
+    input->frame.delegated_frame_data->device_scale_factor = 1.0f;
+
     bool size_changed =
         input->width != view_width_ || input->height != view_height_;
     view_width_ = input->width;