Fix uint indices WebGL test to draw something.

This test was specifying a draw with two indices instead of six.
This wasn't producing any error on most configurations, but on
Android it was producing a driver error that was only visible in
Debug.

BUG=angleproject:2086

Change-Id: I7c3cee4cc10d6c37e3bac8ed9fbc16ecb2cb9e63
Reviewed-on: https://chromium-review.googlesource.com/546539
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
diff --git a/src/tests/gl_tests/WebGLCompatibilityTest.cpp b/src/tests/gl_tests/WebGLCompatibilityTest.cpp
index bfd7d73..b810144 100644
--- a/src/tests/gl_tests/WebGLCompatibilityTest.cpp
+++ b/src/tests/gl_tests/WebGLCompatibilityTest.cpp
@@ -294,7 +294,7 @@
                      "void main() { gl_FragColor = vec4(0, 1, 0, 1); }")
     glUseProgram(program.get());
 
-    glDrawElements(GL_TRIANGLES, 2, GL_UNSIGNED_INT, nullptr);
+    glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, nullptr);
     EXPECT_GL_ERROR(GL_INVALID_ENUM);
 
     if (extensionRequestable("GL_OES_element_index_uint"))
@@ -303,7 +303,7 @@
         EXPECT_GL_NO_ERROR();
         EXPECT_TRUE(extensionEnabled("GL_OES_element_index_uint"));
 
-        glDrawElements(GL_TRIANGLES, 2, GL_UNSIGNED_INT, nullptr);
+        glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, nullptr);
         EXPECT_GL_NO_ERROR();
     }
 }