Added SetLayerTransform to PPAPI

content/renderer/pepper/pepper_graphics_2d_host.cc

Index: content/renderer/pepper/pepper_graphics_2d_host.cc
diff --git a/content/renderer/pepper/pepper_graphics_2d_host.cc b/content/renderer/pepper/pepper_graphics_2d_host.cc
index 5212bcef8707856599fa6210d12074583c130eff..ee3223a838b7e50e32cc01692849d95de0daca9c 100644
--- a/content/renderer/pepper/pepper_graphics_2d_host.cc
+++ b/content/renderer/pepper/pepper_graphics_2d_host.cc
@@ -130,7 +130,7 @@ void ConvertImageData(PPB_ImageData_Impl* src_image,
 }  // namespace
 
 struct PepperGraphics2DHost::QueuedOperation {
-  enum Type { PAINT, SCROLL, REPLACE, };
+  enum Type { PAINT, SCROLL, REPLACE, TRANSFORM };
 
   QueuedOperation(Type t)
       : type(t), paint_x(0), paint_y(0), scroll_dx(0), scroll_dy(0) {}
@@ -148,6 +148,9 @@ struct PepperGraphics2DHost::QueuedOperation {
 
   // Valid when type == REPLACE.
   scoped_refptr<PPB_ImageData_Impl> replace_image;
+
+  // Valid when type == TRANSFORM
+  gfx::Transform transform;
 };
 
 // static
@@ -223,6 +226,8 @@ int32_t PepperGraphics2DHost::OnResourceMessageReceived(
                                         OnHostMsgFlush)
     PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_Graphics2D_SetScale,
                                       OnHostMsgSetScale)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_Graphics2D_SetLayerTransform,
+                                      OnHostMsgSetLayerTransform)
     PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_Graphics2D_ReadImageData,
                                       OnHostMsgReadImageData)
   PPAPI_END_MESSAGE_MAP()
@@ -524,6 +529,28 @@ int32_t PepperGraphics2DHost::OnHostMsgSetScale(
   return PP_ERROR_BADARGUMENT;
 }
 
+int32_t PepperGraphics2DHost::OnHostMsgSetLayerTransform(
+            ppapi::host::HostMessageContext* context,
+            float scale,
+            const PP_Point& origin,
+            const PP_Point& translation) {
+  if (scale < 0.0f)
+    return PP_ERROR_BADARGUMENT;
+
+  gfx::Transform transform_matrix;
+  // Transform matrix contains the scale and translation applied
+  // with the origin the given point.
+  transform_matrix.Translate((1 - scale) * origin.x - translation.x,
+                             (1 - scale) * origin.y - translation.y);
+  transform_matrix.Scale(scale, scale);
+
+  QueuedOperation operation(QueuedOperation::TRANSFORM);
+  operation.transform = transform_matrix;
+  queued_operations_.push_back(operation);
+  return PP_OK;
+}
+
+
 int32_t PepperGraphics2DHost::OnHostMsgReadImageData(
     ppapi::host::HostMessageContext* context,
     PP_Resource image,
@@ -590,10 +617,15 @@ int32_t PepperGraphics2DHost::Flush(PP_Resource* old_image_data) {
   bool done_replace_contents = false;
   bool no_update_visible = true;
   bool is_plugin_visible = true;
+
   for (size_t i = 0; i < queued_operations_.size(); i++) {
     QueuedOperation& operation = queued_operations_[i];
     gfx::Rect op_rect;
     switch (operation.type) {
+      case QueuedOperation::TRANSFORM:
+        ExecuteTransform(operation.transform);
+        no_update_visible = false;
+        break;
       case QueuedOperation::PAINT:
         ExecutePaintImageData(operation.paint_image.get(),
                               operation.paint_x,
@@ -679,6 +711,10 @@ int32_t PepperGraphics2DHost::Flush(PP_Resource* old_image_data) {
   return PP_OK_COMPLETIONPENDING;
 }
 
+void PepperGraphics2DHost::ExecuteTransform(gfx::Transform transform) {
+  bound_instance_->SetLayerTransform(transform);
+}
+
 void PepperGraphics2DHost::ExecutePaintImageData(PPB_ImageData_Impl* image,
                                                  int x,
                                                  int y,