[CherryPick] Set the initial scissor box for WebGL

[Title] [CherryPick] Set the initial scissor box for WebGL
[Issues] TWEB-1131
[Problem] Scissor box isn't initialized. gl-get-calls.html conformance test fails.
[Solution] Initialize scissor box when initializing WebGLRenderingContext

Change-Id: I689add2bb17adcd3345feb96fd373e14f0748074

diff --git a/Source/WebCore/html/canvas/WebGLRenderingContext.cpp b/Source/WebCore/html/canvas/WebGLRenderingContext.cpp
index f14218e..c2bcf82 100755 (executable)
--- a/Source/WebCore/html/canvas/WebGLRenderingContext.cpp
+++ b/Source/WebCore/html/canvas/WebGLRenderingContext.cpp
@@ -525,6 +525,7 @@ void WebGLRenderingContext::initializeNewContext()
 
     m_context->reshape(canvasSize.width(), canvasSize.height());
     m_context->viewport(0, 0, canvasSize.width(), canvasSize.height());
+    m_context->scissor(0, 0, canvasSize.width(), canvasSize.height());
 
     m_context->setContextLostCallback(adoptPtr(new WebGLRenderingContextLostCallback(this)));
     m_context->setErrorMessageCallback(adoptPtr(new WebGLRenderingContextErrorMessageCallback(this)));